Independent: The second group is not given the drug.
Dependent: Dr. Smith wants to examine weather a new drug increases the maze running performance of older rats.
Constants: Dr. Smith teaches two groups of older rats to find a piece of tasty rat chow in the maze.
Answer:Animals that eat only plants are called herbivores (or primary consumers).
Explanation:
The one that best explains ways in which fish and mammals differ is : fish are ectothermic and lays eggs to reproduce, while mammals are endothermic and give birth to offspring
The 'common fish' that give birth to its offspring such as whales and dolphins are considered mammals
hope this helps
When a physical ailment has no apparent medical cause, doctors may suspect a somatoform disorder. Essentially a mental disorder
