The Phanerozoic eon began at the same time as which of these? Select all that apply.

A. the start of the Paleozoic era

B. the start of the Cambrian period

C. the end of the Proterozoic eon

D. the start of the Precambrian super-eon

Which process affects the distribution of minerals? A) the movement of tectonic plates B) the action of wind, water, and glaciers C) the chemical and mechanical decomposition of rock D) all of the above

Membranes studded with photosynthetic pigments in plant cells are

Why has two different alleles for the same trait?

Describe the purpose of the of the glycoprotein spikes found on some enveloped viruses.

Which produces an ionic bond? A. Making neutrally charged atoms B. Sharing valence electrons C. Forming large molecules D. Creating an electrostatic attraction

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.