Which factor contributes to global warming?

Which event is the best example of competition between species in a pond environment?

What is the result of cellular respiration?

When a person breathes, the lungs absorb oxygen, which is used by cells to carry out the process of

What is the original source of energy for any ecosystem?

Why are bacteria and fungi necessary in an ecosystem?

An organism that hunts another is called a

An organism that eats both plants and animals is called a

The base or first level in an energy pyramid is always the

Which of the following organisms is an herbivore?

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