Does oxygen pass through a cell by active transport or diffusion?

Why do you think the urea was not able to diffuse through the 20 mwco membrane? How well did the results compare with your prediction?

What separates the oral cavity from the nasal cavity?

In a, are (Y) and are (y). A=4 B=1 C=2 D=3

Pick two ways do salts enter the ocean. 1. ice bergs melting 2. weathering and erosion 3. black smokers 4. oxygen dissolved from the atmosphere

Chromoplasts, which store starch, are most abundant in roots and tubers

What is osmosis? Describe this process including the types of molecules that move and the energy required. Include in your description details about the areas of concentration on either side of a membrane when osmosis occurs.

Which of the following are extracted from the ocean floor for energy (check all that may apply) Terridenous sediment Hydrogenous sediment Oil and gas Gas hydrates Maganese nodules

1. Energy from the sun comes from fusion. What happens during that reaction? Helium turns into hydrogen. Oxygen turns into carbon dioxide. Carbon dioxide turns into oxygen. 2. Hydrogen turns into helium.

What indicates the gene combination of an individual?

Why does weight loss come slowly following rapid loss during the initial three weeks of a rigorous diet?