When does crossing over occur in meiosis?

A prophase 2

B metaphase 2

C metaphase 1

D prophase 1

Muscarine is a poison found in poisonous mushrooms. muscarine binds to acetylcholine receptors and mimics its action. which of the following describes the effect of muscarine?

If a rock cuts across another rock, then the rock doing the cutting is A. older than the rock getting cut. B. younger than the rock getting cut. C. the same age as the rock getting cut. D. older or younger than the rock getting cut.

Long before hiv had been identified, aids had become stigmatized as a result of its higher prevalence amongst:

What is a contribution of an amoeba to the environment and other organisms?

What would happen to a cell if its channel proteins were dam- aged and unable to transport particles? What would happen to the organism if many of its cells were damaged in this way?

Which statement best describes the relationship between activation energy and rate of reaction? O Increasing the activation energy can increase the rate of a reaction. O Reducing the activation energy can increase the rate of a reaction.

Definition: this is a haploid cell with half the reproductive information from the parent.

Does a cell use energy when molecules diffuse in or out of the cell? Why?

Below is a list of possible challenges. Check all errors that you mentioned in your answer. Traits other than beak type might affect natural selection. It could take many generations to observe adaptions to a population.

A farmer dug a well but did not find any water Which reasons most likely explain why the farmer did not find water? Check all that apply.