21. In what ways are lungs and gills similar? A. Both are used for circulating blood through the body.
B. They both are used in animal mating behavior.
C. Both are organs animals use to exchange oxygen & carbon dioxide.
D. None of the above.

As a small change in a person's dna can cause a genetic disorder

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them

You find a fossil that you are sure shows evidence of bipedalism. you know this because which of the following anatomical traits is present? a. thighbones that angle in toward the knees b. a narrow pelvis c. opposable hallux d. posterior position of the foramen magnum