The reason cells expend large amount of energy to export sodium ions from cells is because
a) sodium is poisonous for cells
b) sodium gradients are needed to make atp
c) sodium gradients can be used to cotransport items in and out of cells
d) sodium always brings a toxic chloride ion with it.
e) all the above are true

What are they five steps of cloning?

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

Babies with very low or very high birth weight are less likely to survive. observe a graph of the data. % babies born at different weights % babies born in that category 6.0 6.5 in 50-555 70-75 80-8511 100-1055 which statement is a valid claim that could be made using the data in the graph? directional selection is occurring because the graph favors an extreme. mark this and retum save and exit next submit o type here to search