Which statement best describes a cause and its effect that occurs during the process of muscle contraction? A.
The shortening of the sarcomere causes the release of calcium around the myofibrils.
B.
The presence of calcium ions within nerve cells causes the sarcomere to shorten.
C.
The release of calcium ions causes myosin and actin to attach to each other.
D.
The pull of myosin on actin causes the motor neuron to send a nerve impulse.

the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

explanation:

the correct answer is d

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms