What cellular structure must oxigen cross to get from the outside to the the inside of an animal cell?

1) the nucleus

2) the cytoplasm

3) the plasma membrane

4) the cell wall

What do you think would happen if a plant did not create enough of the hormone that controlled flower formation

Which list consists of four factors that play a role in determining climate? A. altitude, insolation, ocean currents, soil type B. insolation, mountain ranges, ocean currents, soil type C.

Three liquids with different densitits are dumped into a glass what do you expect to see

Explain three ways that humans threaten biodiversity

Three structures of the internal ear

What are two causes of blood pressure changes that might occur in a person within a given day?

What type of plant cells does most photosynthesis occur?

Life cycle of tobacco mosaic virus

How do producers differ from all other organisms in an ecosystem? A. All other organisms rely directly on the sun for energy. B. Producers are the only group capable of making their own food. C.

The same reptile known as a river turtle in illinois is called a cooter in florida. This language phenomenon is classified as