During an action potential, the local axon membrane repolarizes from +40 mV to -75 mV because of:

FILL-IN: In the eggs of Class Reptilia and Class Mammalia, what is the function of the amnion (an extra-embryonic membrane within the amniotic egg)? Answer in a few words.  

Which of the following statements about skeletal muscle cells and cardiac muscle cells is FALSE?

Genetic drift acts most strongly in:

In general, what are globular proteins used for in the body? (1 pt)

113. Why are lipids strongly non-polar? (1 pt)

There are two types of population regulation factors.  Consider these two examples. The population of deer living in a forest will decrease in a forest fire no matter how many deer are living in the forest . Competition for nesting space increases when the population of birds increase, which may decrease the bird population growth.  The forest fire is an example of a(n) _______________ factor, while the nesting space is an example of a(n) ________ factor.

Toxic chemicals from factories dumped into the ocean makes marine organisms sick and leads to a decline in biodiversity.  What kind of threat to biodiversity is this?

We learned about keystone species and trophic cascades. Discuss keystone species and trophic cascades by describing how the re-introduction of wolves, a keystone species in the Yellowstone Park ecosystem, drove a trophic cascade, starting with elk, that led to the restoration of the Yellowstone National Park ecosystem.  In your discussion, describe how the absence of wolves affected elk, that, in turn, affected rivers and streams, and how the re-introduction of wolves rehabilitated rivers and streams that led to the restoration of the Yellowstone National Park ecosystem.

An effective way of conserving biodiversity is through enacting legislation to protect biodiversity.  What was enacted in 1973 to identify,  protect, and develop a management plan to bring back at-risk species to sustainable numbers?