1. A biologist studying interactions between an animal species and its environment is studying
biology at which level?
b. biosphere
c. organism
d. ecosystem
a. cell

Match the examples to the correct level of organization. 1. system level roses, snakes, puppies 2. organism level roots, stamens, leaves 3. tissue level bone, cartilage, blood 4. organ level heart, veins, arteries

The body of water found at number 4 on the map above is the

Which of the following explains why a tree is often used as a model to represent the principle of common descent