A stem cell is an extraordinary, early stage, unspecified cell that has the potential to develop into a number of specialized cell types.
there important because they can replace cells that have been lost or damaged
Answer:
Option A... Because cholesterol prevents membrane from freezing and maintain membrane fluidity
B adaption because galapagos islands the is like no food
Nerve Signal passes electricity that causes something to move
I would say it's A because the others don't make sense and if they were curved they wouldn't get as much sun