Which activity is most likely a result of a sudden, unexpected change in the environment? a. polar bears growing thicker fur b. fewer plankton making oxygen c. frogs hibernating d. leaves changing color

Explain why in any given geographical region, women tend to have lighter skins( by 3-4% on average) than men?

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

The negative change found inside the plasma membrane is created by potassium ions sodium ions hydrogen ions chlorine ions