Active transport occurs in cells, for example, when the na-k pump is at work. any process that involves active transport most often involves the a. movement of molecules without any predictable pattern. b. movement of molecules from a lower concentration to a higher concentration. c. movement of molecules from a higher concentration to a lower concentration. d. movement of molecules from a lower to higher concentration and then back to the point of origin.

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.

As an asteroid comes close to earth, it's name will change to? apex

Explain how the parts of the peripheral nervous system work with the central nervous system to produce a response to the stimulus