Answer:
Cell membranes control the substances that enter or leave cells.
Explanation:
Without a cell membrane the organism will be unprotected and the homeostasis will die.
Some examples of important nonliving things in an ecosystem are sunlight, temperature, water, air, wind, rocks, and soil. Living things grow, change, produce waste, reproduce, and die.
table\
chair
computer
desk
sun
moon
water
air
backpacks
pencils
keyboards
computer mouses
B.the thick fur on an animal to protect it from cold weather
C.an increasing heart rate when blood oxygen levels drop
D.the presence of allergens in the air