The diffusion of oxygen gas across the cell membrane always occurs -
a with the assistance of cellular energy in the form of atp
b along the concentration gradient of the oxygen gas
c from an area of lower concentration to an area of higher concentration
d at the same rate as the diffusion of carbon dioxide gas

a few examples of ethical concerns involving genetically engineering of humans include

-privacy of genetically tested people

- potential side effects

-long term effects

some fungi obtain their nutrients from a living host (plant or animal) and are called most biotrophic fungi have fairly narrow host ranges—they are specialized on a limited called rhizomorphs that allow the fungus to grow from one tree to another. ascospores are formed inside a sac-like structure called an ascus. so your answer is a