The sodium-potassium pump regulates the amount of sodium and potassium inside of cells, particularly nerve and muscle cells. in this process, an atp is burned, causing three sodium ions to be pumped out and exchanged for two potassium ions, which are pumped in by a membrane protein. both ions go against their concentration gradients. the sodium-potassium pump is an example of a) phagocytosis. b) passive transport. c) active transport. d) facilitated diffusion.

This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

Which statement is not an accurate description of meiosis? a) meiosis produces offspring that are genetically diverse. b) meiosis produces offspring that are identical to the parent. c) in sexual reproduction half of the genetic material comes from the father (sperm) and half of the genetic material comes from the mother (egg). d) meiosis decreases the number of chromosomes by half so that when a sperm fertilizes an egg, the resulting zygote has the correct number of chromosomes.