These kinds of organisms are made of multiple cells working together

This organ system controls your breathing, and is responsible for bringing oxygen into the body.

This organ system is responsible for distributing oxygenated blood through the body.

The purpose (or job) of an organ is also called the

The first level of biological organization is the cell. The second is

Collections (groups) of organs that work together for a common system are called

The process of breathing

Which body parts are part of the respiratory system? (Check all that apply)

Bacteria are usually

Complex organisms like humans, snails, and chickens are

The process by which we absorb and use nutrients from food

An action your body does automatically, like breathing and your heart beating are called

What is the function of red blood cells?

What's the function of the circulatory system?

This is the process by which blood becomes sticky, and can create a scab.

Which of these are unicellular?

Which of these are multicellular?