The cross bridge cycle is a series of molecular events that occur after excitation of the sarcolemma. what is a cross bridge? hints the cross bridge cycle is a series of molecular events that occur after excitation of the sarcolemma. what is a cross bridge? a myosin head bound to actin atp bound to a myosin head troponin bound to tropomyosin calcium bound to troponin

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

Elephants in the savanna regions of africa dig holes in dried up river beds to reach water lying just below the surface. these holes provide drinking water for other animals as well. so, without the elephants, many animals might otherwise die from lack of water during the dry season. the location in which the elephants live is an example of a/n and the role they play in creating water holes is an example of a a) ecosystem; habitat b) community; niche c) habitat; niche d) niche; habitat

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?