Organisms are classified as insects based on their

Nutrients from digested food enter the blood stream through the process of

The kidneys, which remove dissolved wastes from the blood, are organs of the

Which two systems of a rabbit\'s body must be working together for the rabbit to run away from a fox?

In which process is oxygen used to release the energy stored in food

Infectious diseases are caused by

What is the function of DNA in a cell

What is the main function of the circulatory system?

Cells are to tissues as tissues are to

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

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