B. It allows sodium and potassium to move against their concentration gradient
Explanation:
The role of sodium and potassium pump in the body is to help move ions against their concentration gradient. There are two types of transport (1) active transport (2) passive transport.
Passive transport is a natural phenomenon in which ions move from high concentration to lower concentration. In such transport no ATP/energy is required. In contrast to this, active transport is a kind of transport which occurs against concentration gradient and in order to facilitate this opposite movement of ions they require ATP/energy input. Sodium and potassium pumps perform active transport in our body. In neurons they play an important role of ion exchange. They move sodium and potassium ions against their concentration gradient for which they require ATP and thus help in basic functioning of neurons.
if the earth had not evolved it would be just like every other planet, no life forms, not polluted and pure. it would be clean and there would probably be a few organisms but not how we are now. Global warming would not be there and the plastic in the oceans would also not be there.
A) Some protists evolved into other eukaryotic groups.
<h3><u>Explanation</u>;</h3>
Protists are eukaryotes , making them much more complex than the prokaryotes, such as bacteria.
Protists may be classified as a paraphyletic group, since they are difficult to group under a single ancestor because of their diversity and dissimilarity from each other.
Protists evolved from prokaryotes, eventually giving rise to the entire line of eukaryotes that exists today.
