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.
One organism that was influenced is fish in the ocean thanks to the Plankton. Because of the increasing amount of CO2, the plankton which lives off of it has started to multiply and take away more and more air from the water which is causing fish to die out. Thanks to this, huge amounts of water are full of dead fish and are polluted almost beyond repair. This is also seen in the coral reef area which has started to die out.
Another one affected on land is the polar bear which has more and more difficulty finding food and have even been reports that they've turned even to eating eggs of other animals because the way the CO2 is affecting the freezing of the sea they have problems finding food.
The nervous system sends electrical impulses to certain cells receptors that stimulate the immune system to produce antibodies to fight foreign bodies.
Hey Leeann479!
The chart that shows all the possible combinations of alleles that can result from a genetic cross is called a
Punnett Square! I've attached an example of one to this answer.
Hope this helps!
(image credit: Wikipedia)
