When pollen grains land on: sperm cells or zygotes?

In which of the following relationships is one organism always benefited while the other organism is always harmed

Which of the following human activities resulted in the growth of the north american deer population?

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