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.

Which of the following statements about archaea and bacteria is true? a. neither is single-celled. b. they both have nuclear membranes. c. neither reproduces by binary fission. d. they both lack a nuclear membrane.

Several bird species feed in a certain species of tree. each bird species feeds in a different part of the tree. which statement is true of these bird species? a. they have adapted to different niches due to competition b. they have a carnivorous relationship with the tree species. c. they have adapted to different niches due to predation d. they have a symbiotic relationship with the tree species.

Below are the three main organs that make up the plant body. what is the main function of the structure that is identified as b in the picture above? it anchors the plant.it produces food.it absorbs nutrients.it supports the plan