Answer:
Spongy bone
Explanation:
The bone density is reduced and allows the end of bones to compress when stress is applied
Parasites live in or on and do not kill the host organism.
Answer:
Calcium ions
Explanation:
The excitation-contraction coupling process is the process by which the electrical activation of muscles (the depolarization of the action potential) leads to the activation of contraction.
An action potential in the skeletal muscles or muscle excitation leads to Ca release from the sarcoplasmic reticulum via calcium channel protein. Released Ca regulates the contraction of the muscle.
Ummmmm not to sure about this would you be able to explain more on what you mean
Because acid will lower the ph