The presence of reptile tracks in sandstone formations is an indication that the area used to be

What is the process through which many animals develop irreversible species-specific behavior patterns?

A. altruism B. taxis C. operant conditioning D. cognitive learning E. imprinting

Portuguese water dogs have evolved to spend a lot of time in water and thus have webbed

feet. What process does not occur in these dogs but does occur in other dogs that do not have webbed feet?

a. apoptosis b. mitosis c. cell differentiation d. signaling pathways

This is best described as how an animal responds to stimuli in its environment:a

behavior. b. learning. c. proximate causes. d. ultimate causes. e. direct fitness..

One advantage of gas exchange in water is that

A) water can contain more oxygen than air. B) carbon dioxide is easier to eliminate in water than in air. C) it is easy to keep the exchange surface wet. D) ventilating gills in water requires very little energy.