Which of the test tubes shown below was most likely produced by a sprig of elodea and a snail in the dark after 12 hours of incubation?
test tube 1
test tube 2
test tube 3
test tube 4

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?

You want to cultivate some exotic plants at your farm. however, the climate is chillier than the temperature range favorable to the crop. which is the best method to use for the cultivation of this exotic crop? a. use a crop rotation method b. use a lot of fertilizer c. prepare the seed bed properly d. use a greenhouse e. use irrigation

Body temperature is tightly regulated in mammals for example when external temperatures drop too much the body of a mammal response by in order to it's core temperature.