The energy needed to "pump" sodium outside the cell in active transport is ATP. Adenosine triphosphate (ATP) is the energy currency of life - a high-energy molecule that stores the energy we need to do just about everything we do.
Answer from: Quest
the answer is "a.) well–developed vascular system."
explanation:
Answer from: Quest
desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.
The seed coat's most important function is to provide a) a nonstressful environment for the megasporangium. b) the means for dispersal. c) dormancy. d) a nutrient supply for the embryo. e) desiccation resistance.
Flock x flock y flock z total pieces of food eaten (from previous page) 147 93 60 food percentage* % % % simulated number of birds in flock for 3rd generation** * divide each flock's total pieces of food by 300, the total number of pieces of food eaten. ** multiply the food percentage for each flock by the total number of birds (30).