Which is not part of the circulatory system

A. heart

B. air passageway

C. blood

D. blood vessels

Which of the following controls the activity of all the others? O ovaries O testes O hypothalamus O pituitary glands

How is continental crust different from oceanic crust? Oceanic crust is thinner and more likely to sink. Continental crust is more dense and lighter. Continental crust is thicker and more likely to sink. Oceanic crust is thicker and more dense.

A plant deprived of light dies. Which of the following best explains why this happens?

Which of these is the most important factor when classifying an organism? A. It's characteristics B. It's age C. It's role in the food chain D. It's potential for extinction

For most populations that are growing, as resources start to become less available, the population

A man who is normal for color vision marries a woman who is colorblind. What is the probability their offspring will be colorblind if all of their children are male?

When the ocean absorbs co2, the ph of the ocean water drops whats is the effect of this?

Why do muscles contain mitochondria

7. What is an index fossil?

Explain what it means when a molecule is referred to as being hydrophobic or hydrophilic. Give an example.