Which of the following statements about the tundra is not true? a. The tundra has limited vegetation. b. There are two main categories of the tundra biome. c. Temperatures in the tundra can get below -20° F. d. The tundra biome does not support animal life.

Answers

Answer 1

Answer:

The tundra biome does not support animal life. D just took the test

Answer 2

Answer: i would say a beacause tundra is very cold desert snd only certain amount of vegetation can happen

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If birth rates fall below the replacement level, than a country is in which stage of demographic transition?

Rosalind Franklin and Maurice Wilkins took X-ray photographs of DNA that revealed the molecule was shaped like a ___

Answers

Helix...............................................................................................................................................

HELIX

is correct for gradpoint

Gravity is the force by which a planet or other body draws objects toward its center. The force of gravity keeps all of the planets in orbit around the sun. What does the force of gravity depend on?

Answers

The mass of an object and the distance of the object.

If a theory is challenged by new evidence, which of the following couod occur?A. the theory could be altered
B. the theory is accepted, not the evidence
C. the evidence is wrong
D. a vote is taken to accept new evidence

Answers

A. The theory could be altered. If new evidence I presented it is the law to take a look at it.

Final answer:

If new evidence challenges a theory, it may lead to the alteration of that theory. This is a key aspect of the scientific method, where theories and hypotheses are continuously tested. The climax of these tests can lead to validation, modification, or discarding of the theory.

Explanation:

If a theory is challenged by new evidence, a possible outcome is that the theory could be altered. In the realm of science, theories are not static; they are dynamic and prone to modifications when new, credible evidence emerges. Theories are always subject to validation and verification. When the theory of evolution was first proposed, for instance, it faced plenty of criticism and disbelief. However, as it was continually supported by emerging evidence, it is now widely accepted.

An assumption or hypothesis is typically tested through experiments. If experimental results contradict the theory or hypothesis, scientists often amend or discard it. This process exhibits that theories aren't absolutes but rather are continually evolving constructs subject to change based on the emergence of new evidence.

This is part of the scientific method, where theories and hypotheses are continuously tested and re-tested using experiments. It's also important to remember that evidence-based science values new findings that can be replicated and verified across multiple experiments, confirming or questioning existing theories.

Learn more about Science Theory here:

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Which process will result in a gain of energy in an ecosystem

Answers

Photosynthesis will result in gain of energy in an ecosystem

"Nearly all of the energy that drives ecosystems ultimately comes from the sun. Solar energy, which is an abiotic factor, by the way, enters the ecosystem through the process of photosynthesis. You can learn more than you want to know about this process in the unit on photosynthesis. Or, you could just chat with your local botanist. Everyone has one, right? The organisms in an ecosystem that capture the sun’s electromagnetic energy and convert it into chemical energy are called producers. Not to be confused with these Producers.

The name is appropriate because producers make the carbon-based molecules, usually carbohydrates, that the rest of the organisms in the ecosystem, including you, consume. Producers include all of the greenplants and some bacteria and algae. Every living thing on Earth literally owes its life to the producers. The next time you see a plant, it wouldn’t be a bad idea for you to thank it for its services...which, as you will learn in other units, go way beyond just supplying you with food.

After a producer has captured the sun’s energy and used it to grow yummy plant parts, other organisms come along and greedily gobble it up.These primary consumers, as they are called, exclusively feed onproducers. If these consumers are human, we call them vegetarians. Otherwise, they are known as herbivores.

Primary consumers only obtain a fraction of the total solar energy—about 10%—captured by the producers they eat. The other 90% is used by the producer for growth, reproduction, and survival, or it is lost as heat. You can probably see where this is going. Primary consumers are eaten bysecondary consumers. An example would be birds that eat bugs that eat leaves. Secondary consumers are eaten by tertiary consumers. Cats that eat birds that eat bugs that eat leaves, for instance.

At each level, called a trophic level, about 90% of the energy is lost. What a shame. So, if a plant captures 1000 calories of solar energy, a bug that eats the plant will only obtain 100 calories of energy. A chicken that eats the bug will only obtain 10 calories, and a human that eats the chicken will only obtain 1 calorie of the original 1000 calories of solar energy captured by the plant. When you think about this way, it would take 100 1000-calorie plants—those would be enormo plants, by the way—to produce a single 100-calorie piece of free-range chicken. You are now recalling all of the plants you have ever forgotten to water in your life and feeling really, really terrible about it, aren't you?

The relationships among producers, primary consumers, secondary consumers, and tertiary consumers is usually drawn as a pyramid, known as an energy pyramid, with producers at the bottom and tertiary consumers at the top. You can see from the example above why producers are at the bottom of this pyramid. It takes a lot of producers for higher-trophic-level consumers, like humans, to obtain the energy they need to grow and reproduce.

This is the answer to the great mystery as to why there are so many plants on Earth. We will even spell it out for you because it is so important to understand: there are so many plants on Earth because energy flowthrough ecosystems is inefficient. Only 10% of the energy in one trophic level is ever passed to the next. So, there you have it. We hope you feel fulfilled.

In addition to energy pyramid diagrams, ecosystem ecologists sometimes depict the relationship between trophic groups in a linear way, with arrows pointing from one organism to another. If there is only one producer, one primary consumer, one secondary consumer, and one tertiary consumer, this linear diagram is called a food chain. Food chains help ecologists and students visualize the interactions between organisms in an ecosystem. As always seems to be the case, it isn’t ever that simple. In fact, trophic interactions among organisms in an ecosystem are often really complex. It’s rare that an ecosystem only has one species at each trophic level. Usually, there are multiple producers that are eaten by multiple primary consumers. Some consumers eat different kinds of producers. Likewise, secondary consumers sometimes eat producers as well as primary consumers. These are known as omnivores.

These complex relationships are often depicted—if they can be figured out, that is—in a diagram called a food web. These diagrams can become messy indeed, depending on the size of the ecosystem and the number of interactions among trophic groups. If you like puzzles and biology, though, ecosystem ecology is the field for you.

Ecologists use food webs to better understand the intricate workings of the ecosystems they study. Understanding exactly who is eating whom can provide valuable information for conservation biologists as well. Such knowledge can aid in restoration efforts, species recovery projects, and preservation efforts, just to name a few instances. In any case, uncovering food webs goes a long way to understanding the first half of an ecosystem, the community.

Of these layers of the atmosphere, which is the least dense?A. exosphere
B. stratosphere
C.troposphere
D. mesosphere

Answers

Answer: The first person is wrong

Explanation: its A. exosphere

Who is responsible for bring the Aztec Empire to an end?Francisco Pizarro
Hernan Cortes
Christopher Columbus

Answers

Answer:

Hernan Cortes

Explanation:

hope this helps

Answer:

Hernán Cortés

Explanation:Spanish conquistadores commanded by Hernán Cortés allied with local tribes to conquer the Aztec capital city of Tenochtitlán. Cortés's army besieged Tenochtitlán for 93 days, and a combination of superior weaponry and a devastating smallpox outbreak enabled the Spanish to conquer the city.

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