In an experiment to determine the effects of radiation on the germination of seeds, a factor that has to be controlled is a. the amount of radiation. b. the types of radiation. c. the germination rate of seeds. d. the amount of water added to the seeds.

Are characterized by dry conditions, limited vegetation and wide temperature range. a.) tropical rain forests b.) deserts c.) grasslands d.) none of the above

During the day, plants produce by splitting water molecules in the light-dependent reactions of photosynthesis. at the same time, plants use cellular respiration to produce some of the needed by the light-independent reactions to make sugars. during the night, plants produce because takes place.

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?