Change one thing about the earth's physics or weather and discuss how this would change one of the biomes that are introduced. Example: How might a lower gravity effect a tropical forest.

For each of the following, indicate whether the property corresponds to graded potentials, action potentials, both, or neither. Can sum Are affected by refractory periods Are a result of opening or closing of ion channels Dissipate in size as the potential moves away from the site of initiation All-or-none.

Explain how predator and prey populations control each other. Your explanation should include discussion of things like population cycles and carrying capacities. What significant differences would you expect in relative population sizes between an ecosystem where the major predator was cold blooded, and an ecosystem where the major predator was warm blooded? For the sake of the exercise, assume that these two predators are about the same size and weight, and that both are exclusively carnivorous. HINT: Consider how the food requirements of a cold blooded animal differ from those of a warm blooded animal. This is all about relative population sizes.

Imagine you are an ecologist, and you do a census of all of the animal species within a particular ecosystem. You discover that the total combined populations of the tertiary consumer species in the ecosystem are a lot smaller than the combined total population sizes of all of the secondary consumers in the ecosystem. Should you be surprised? Why or why not. Be specific about this final part of the answer, and be sure to utilize the concepts of ecology which are pertinent to this question.