An organism's ability to maintain a stable internal environment in the midst of external environmental change is known as

Organisms must be able to adapt to a changing external and internal environment. An organism's ability to maintain a stable internal environment is known as homeostasis. How does a cell's membrane help an organism maintain homeostasis? Cell membranes control the substances that enter or leave cells.

Explanation:

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.