D. 3 this is because it is force over mass and 144/48 is equal to 3
Answer:
so the difference is
Explanation:
While the digestive system collects and removes undigested solids, the excretory system filters compounds from the blood stream and collects them in urine. They are closely connected in controlling the amount of water in your body.
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Answer:
A Gene pool is best described as, all the alleles present in an population.
Explanation:
Answer: selective permeability.
The cell is said to be selectively permeable
Explanation:the cell membrane is the membrane that covers the living portion of the cell.the is the boundary between the cell and it's extracellular environment.
The cell membrane contains lipids ,proteins and carbonhydrate.the lipids forms a bilayer in which proteins are embedded.the bilayer allows some materials to move through the cell membrane more easily than others.thus the cell is said to be selectively permeable.
Small molecules such as oxygen gas, nitrogen gas ,which can dissolve in the lipids,can easily pass through.uncharged molecules can also pass through eg carbon dioxide.
Large polar molecules eg glucose,amino acids etc.can not easily pass through and they may need to be carried by transport proteins