Answer: A cactus has needles to prevent animals from eating the water out from it.
Explanation:
The cell membrane separates the intracellular environment from the extracellular environment outside of the cell. A phospholipid is composed of a phosphate group and a lipid. It is composed of a hydrophilic, polar phosphate head and two hydrophobic fatty acid tails.
The structure of the bilayer is such that the tails are shielded from contact with water, creating a selectively-permeable barrier which will be impermeable to most hydrophilic molecules.
So, the answer is A) To maintain balance of water and nutrients in the cell.
The Fetal Stage
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1 cubic foot = 7.4805 gallons. 1 cubic foot per second = 7.4805 gallons flowing by a particular point in 1 second. ...Acre-foot
