Which process must occur for a muscle to be able to relax? O A.
The amount of ATP in the neuromuscular junction must increase.
© B.
Myosin and actin must attach to each other.
O C.
A nerve must initiate an action potential in the muscle fiber.
The concentration of calcium in the myofibril must decrease.

The serengeti plains are part of the african savanna ecosystem and are home to a variety of different species of plants and animals. the serengeti plains experience a seven-month period of seasonal drought each year, during which the ecosystem receives only four inches of rain and the availability of some resources becomes very scarce. which type of limiting factors does the seasonal drought in the serengeti plains affect?