When we say that an experiment is controlled, we mean that _____.

A.
the outcome is certain


B.
the theory has already been supported


C.
there is only one theory being tested by the experiment


D.
there is only one difference between experimental groups

During the fermentation process in bread making, yeast metabolizes sugars to produce ethanol and carbon dioxide. This carbon dioxide causes the bread to rise by creating gas bubbles within the dough, leading to a light and fluffy texture once baked.

The process of fermentation helps bread rise due to the action of yeast, a type of fungus, on the sugars present in the dough. When yeast metabolizes these sugars in an anaerobic environment (without oxygen), it undergoes alcoholic fermentation. This fermentation results in the production of ethanol and carbon dioxide (CO2). The CO2 is what causes the dough to rise, as the gas forms bubbles within the dough, expanding it and giving bread its light and fluffy texture.

The balanced chemical reaction for the fermentation of glucose during this process is:

C6H12O6 → 2C2H5OH + 2CO2

Glucose is converted into ethanol and carbon dioxide. The carbon dioxide gas gets trapped in the matrix of hydrated starch and protein molecules in the dough, which leads to the formation of small holes that we see in bread, contributing to its texture.

When the air temperature over land is higher than the air temperature over water, the air over land rises due to the lower pressure, hence c is the correct option.

Because when the air temperature over land is higher than the air temperature over water, the air over land rises due to the lower pressure, and air over the ocean in to replace it.

The land surface warms up more quickly than the sea surface during the day, just to refresh your memory, warmer air is lighter than colder air.

Throughout the day, there can be large variations in the air temperature over the land.

Therefore, always higher than air over the ocean are air temperatures over land, hence c is the correct option.

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Answer:

Succulent plants store water in fleshy leaves, stems or roots. Several other adaptations are essential for the water storing habit to be effective.

Explanation:

Answer:

the answer is D

Explanation:

D) The broad leaves provide surface area to catch light.

Rainforests are tropical forests that receive a high amount of rainfall, typically more than 200 cm per year. They are found in regions near the equator, where the climate is warm and humid. Rainforests are characterized by their dense canopy of tall trees, which can reach up to 60 meters in height. The high rainfall and warm temperatures create a rich and diverse ecosystem, with numerous plant and animal species living in the forest.

Rainforests are also known for their lush undergrowth, including shrubs, ferns, and vines. They play a critical role in the global climate, as they absorb and store large amounts of carbon dioxide, and are also important sources of oxygen. However, rainforests are facing severe threats from human activities such as deforestation and conversion of land for agriculture, which can lead to loss of biodiversity and other negative impacts on the environment.

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DNA, enzymes, fat, and sugar are the biological and organic compounds, which play a crucial role in living organisms.

DNA is present in the chromosomes and encodes the information needed for an organism to develop, survive, and reproduce. The DNA consists of coding regions known as genes. DNA belongs to the category of nucleic acids.

Enzymes are biological catalysts, which catalyze several chemical reactions required for the survival of organisms. All enzymes belong to the group of organic compounds known as proteins.

Fats are the macronutrients, which are made up of glycerol and chains of fatty acids. The fats yield the maximum amount of calories when used up in metabolic reactions. The fats belong to the group of organic compounds known as lipids.

Sugar is the sweet-tasting compound or substance, and are the primary sources of energy in almost every living being. The sugars such as glucose, fructose, starch, and cellulose carry out many functions. The sugars belong to the organic group of carbohydrates.

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The new nutritional graphic, MyPlate, is designed like a table setting to provide a relatable and easy-to-understand guide for creating a balanced meal with appropriate proportions of food groups. It aligns with the USDA's recommended dietary guidelines and works in conjunction with nutrition facts labels to aid in healthy food selection.

It is helpful that the new nutritional graphic is shaped like a table setting because it offers a simple and intuitive guide to healthy eating at each meal. The tool in question, MyPlate, developed by the United States Department of Agriculture (USDA), replaces the former MyPyramid and is a visual guide detailing the proportions of the five food groups: vegetables, fruits, grains, protein, and dairy. This format mimics an actual place setting, which makes it easier for individuals to relate the guidelines to their everyday meals. The design encourages the incorporation of healthy eating patterns by illustrating a balanced plate that contains a variety of food groups at appropriate proportions.

In practice, MyPlate communicates that half of the plate should be filled with fruits and vegetables, the other half should be grains and proteins—with a higher proportion of grains—and dairy products are represented by a drink but can include other dairy forms. Additionally, nutrition facts labels provide specific information about the nutrient content and ingredients of packaged foods, aiding individuals in making informed choices that align with nutritional guidelines. Together, MyPlate and nutrition facts labels are tools that support the public in understanding nutrient and energy density which is key to making healthier food choices.

The chemical property as well as physical one is determined by the arrangement of the mineral's atoms. The correct option is A.

A chemical property is any property of a material that emerges during or after a chemical reaction.

That is, any quality that can only be established by changing a substance's chemical identity.

A physical property is a property of a substance that can be observed or measured without changing the substance's identity.

Color, density, hardness, and melting and boiling points are examples of physical properties.

The atomic structure and crystal chemistry of minerals determine their physical properties.

Crystal form, color, hardness, cleavage, and specific gravity are the most common physical properties.

Examining a mineral's crystal form is one of the best ways to identify it.

Thus, the correct option is A.

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Answer:

It is mollusks

Explanation:

I just did the quiz and it was 100%

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Answer:

The pure tall plant has equal alleles (AA or aa) while the hybrid tall plant has one dominant and recessive allele (Aa).

Explanation:

When we say that an organism is pure, we mean that it is homozygous. In this case we are saying that, for a given trait, its alleles are equal. This means that the allele is occurring in double dose in that organism and, consequently, the gametes generated by it will be equal. A pure tall plant has alleles equal to "AA" or "aa".

When we refer to hybrid organisms, we are referring to heterozygous organisms. In this case we are saying that, for a certain characteristic, the alleles are different. For this reason, in gametogenesis, it is possible to observe the presence of two distinct gametes. A hybrid tall plant has different "Aa" alleles.

The answer is unbalanced forces!

The numerical opportunity that something will happen is known as probability. It's a number between zero and one, with key principles such as the sum of all possible outcomes' probabilities equaling one. A typical example is the 50% chance of a coin toss resulting in heads.

The mathematical chance that something will happen is known as probability. It is expressed as a number between zero and one, where zero means the event is certain not to occur, and one indicates the event is certain to occur. Probability takes into account all possible outcomes of a particular event and the sum of their probabilities must equal one.

There are key principles to understand when calculating probability:

Probability can be demonstrated with classic examples like tossing a coin. If you toss a fair coin, the theoretical probability of landing on heads is 0.5 or 50%, since there are two possible outcomes: heads or tails, each equally likely to occur.

The correct answer is: The light energy travels through the water until it is reflected or absorbed.

Law of conservation of energy is defined as that states that light energy cannot be created or destroyed but converts from one form to another.

When deep ocean lantern fish produces light in water it travel along some distance and then comes back, the light travels in waves and when it hits water waves it either reflects back or absorbed.

Answer:

Explanation:

As we know, atoms are the smallest particles of matter and represent the true creators of matter and everything that occupies space and has mass. Atoms are composed of electrons, protons and neutrals.

Electrons allow one atom to interact with another, forming bonds that allow something tangible to be created. This interaction can occur in three ways:

Answer:

a. Australopithecine Afarensis

Explanation:

With a skull of 3 million years, scientists have been able to prove the existence of Australopithecus afarensis, the oldest ancestor of humanity. 4 million years ago, humanity did not exist. But at least one creature bore in its bones what would be the hallmark of Homo sapiens. Australopithecus afarensis, that creature's name, had a tiny brain. But it stood like no monkey could do, representing an ancestral trait that would be passed from generation to generation to modern man.

Lactic acid fermentation is most likely to occur during a very fast run, as the intense activity causes muscles to run out of oxygen and switch to fermentation to produce energy.

Lactic acid fermentation is most likely to occur under conditions where the muscles have run out of oxygen and need to find an alternative way to produce energy. Among the options provided, A. A very fast run is the condition under which lactic acid fermentation is most likely to occur. When muscles are used to the point of fatigue, such as during an intense activity like a sprint, there isn't enough oxygen supplied to the tissues to meet the high energy demands. This causes the muscle cells to switch from aerobic respiration to lactic acid fermentation, a process where pyruvate is reduced to lactate by NADH, thus regenerating NAD+ which allows glycolysis to continue producing ATP.

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The fern is a vascular plant that reproduces by producing spores. This plant produces no fruits or seeds. The ferns have complex leaves, and have true stems and roots. The presence of a fern fossil in a sedimentary rock indicates that the rock present on the land. The fern plants are found above the land, and this rock must have been present there for it to contain the fern fossil.

Hence, The correct answer is 'Option C - the area was on land'.

A sedimentary rock with a fern fossil indicates that the area was on land when the rock was formed, as ferns are terrestrial plants. The presence of terrestrial plant fossils provides clear evidence of past environmental conditions, distinguishing from marine fossils like oyster shells that suggest former oceanic environments.

The discovery of a sedimentary rock containing a fern fossil tells us that the area where the rock was formed was likely on land. This inference is due to ferns being land-based plants; thus, their presence suggests that the region would have had to be above water for the ferns to grow and subsequently be fossilized. In comparison to marine fossils, such as oyster shells found in sedimentary environments indicating former ocean coverage, ferns unequivocally point towards a terrestrial habitat during the time the rock was formed.

Regarding temperature, while ferns can exist in a range of climates, the mere presence of a fern fossil does not provide definitive evidence of the climate being specifically hot or cold. Additionally, sedimentary rocks on Earth have been formed under various conditions, including volcanic activity, which contributes to the layers and composition of the Earth's surface. The key takeaway is that the fossilized fern indicates that the area had terrestrial features rather than being covered by an ocean.

Answer:

The bottom half

Explanation:

The lower half  part of the iceberg displaces water equal in weight to the buoyant force.

When an object is placed in a fluid, the fluid exerts an upward force we call the buoyant force. The buoyant force comes from the pressure exerted on the object by the fluid.

Because the pressure increases as the depth increases, the pressure on the bottom of an object is always larger than the force on the top - hence the net upward force.

The buoyant force is present whether the object floats or sinks. The object experiences forces on each of its six sides. On each side, the force is the pressure multiplied by the area of the side, and is directed perpendicular to the side and toward the inside of the object.

Therefore, The lower half  part of the iceberg displaces water equal in weight to the buoyant force.

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The hydrophobic center to a cell membrane (also known as a phospholipid bilayer) gives the membrane selective permeability