For natural selection to happen <span>there must be genetic variation in the population for it to even work</span>
The answer is no cell wall. plant cells have cell walls and if animal cells had cell walls, we wouldn't be able to move as freely as we do.
Answer- cell X
Explanation- prokaryotes doesn’t have a Nucleus nor chloroplasts
and is prevented in the absence of , which causes calcium to trigger contraction through a response with regulatory proteins.
and filaments of the fibrils glide into one another as a result of calcium diffusing in the cytoplasm, resulting in the of the complete muscle fiber. The SERCAs pump (Sarcoplasmic/endoplasmic reticulum calcium ATPase) actively pumps ions back into the sarcoplasmic reticulum when the action potential decays.
To learn more about refer:
#SPJ10
The metamorphosis of the stages of a butterfly. The metamorphosis of a frog. Butterflies go from cocoon to caterpillar to butterfly. A frog goes from tadpole to frog.