What is the correct order of body organization from biggest to smallest?

Omnivores consume only animals.

The major way that cells of the immune system communicate is by secreting signaling proteins called:

What are the two major cell types in the nervous system?

What are ways that your body maintains homeostasis?

Heart murmurs occur when the:

The ____ and ____ circuits are the two loops in the human circulatory system.

What makes it possible for animals to attain greater size and physiologogical complexity than single-celled organisms?

____ are tiny porous vessels that allow diffusion of gas, nutrients, and other molecules into and out of tissues.

Which of the following contains the most stored energy?