Which of the following do humans NOT get from food?

Which of the following would most likely contain carbon?

DNA is a type of

The structure of hair is formed by keratin. Keratin is most likely which of the following polymers?

Human genetic traits are controlled by

In winter many dogs grow a thick coat of fur. This is an example of

If you reach out and touch a dog's ear while he's sleeping it twitches. This is an example of

Which of the following is NOT a characteristic of all living things?

Which of the following do humans get from eating fats?

Many plants have a waxy cuticle to prevent them from losing water. This is made of

Which of the following best describes the function of enzymes in biological systems?

Which of the following is NOT a living organism?

What characteristic do all living things share?

To be considered a living thing, an organism must be able to

In order to be considered a living thing an organism must

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