What needed materials enter an animal cell through the cell membrane?

Ascientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas which group of statements best describes all of the materials he is using in the investigation?

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?

Using the gas pedal analogy explain the impact on the cell cycle of one mutated tumor suppressor gene allele versus two mutated tumor suppressor alleles