Answer:
The correct answer is: geography and UV radiation.
Explanation:
Skin variation occurred thanks to evolution, and was driven as a consequence of the geographical location of different populations of humans.
The humans that lived in hot and sunny places, closer to the equator, where much more exposed to the sun's ultraviolet radiation. In order to survive the amount of UV lights that they were exposed to, new humans in those regions were being born with a darker skin tone, which was rich in melanin (a brown pigment that protects us from the sun radiation).
Contrary to these humans that lived in the tropical areas, the humans that populated the areas that were closer to the poles, developed much lighter skin as a result of lower amounts of melanin in their skin. Since sun exposure in the poles is very limited, humans needed to receive as much as they could for the production of Vitamin D, and thus, their skins got lighter and less protected.
Answer:
A
Explanation: a is the most logical reason
Answer:
a) another living cell
Explanation:
"All living cells arise from pre-existing cells by division."
Answer;
ATP would not be produced by oxidative phosphorylation.
If the inner mitochondrial membrane were freely permeable to h+, ATP production by ATP synthase through oxidative phosphorylation would not occur.
Explanation;
-Oxidative phosphorylation is the process in which ATP is formed as a result of the transfer of electrons from NADH or FADH 2 to O 2 by a series of electron carriers.This process, which takes place in mitochondria, is the major source of ATP in aerobic organisms.
-Oxidative phosphorylation is made up of two closely connected components: the electron transport chain and chemiosmosis. The electron transport chain forms a proton gradient across the inner mitochondrial membrane, which drives the synthesis of ATP via chemiosmosis.
-Therefore; If the inner mitochondrial membrane were freely permeable to h+, ATP production by ATP synthase through oxidative phosphorylation would not occur.
