Most animal cell membranes have proteins that pump ions out of the cell and potassium ions into the cell. a) calcium b) carbon c) magnesium d) sodium

If the birth rate of a population of dolphins is 2.0, the death rate is 0.5, and the population size is 100, what is this dolphin's population growth?

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures

What processes take place before the mature mrna exits the nucleus?