Choose all the answers that apply.

The earth's atmosphere:

A-is made mostly of oxygen
B-helps recycle water
C-protects the earth from harmful radiation
D-reduces the temperature extremes between day and night
C-recycles carbon dioxide and oxygen

The effect of a hormone on a target cell may be decreased by the presence of

Tay-sachs disease is a human genetic abnormality that results in cells accumulating and becoming clogged with very large, complex, undigested lipids. which cellular organelle must be involved in this condition?

Ascientist observes certain changes in the physical features of a particular species over time. she concludes that the species has undergone evolutionary change. she wants to study the animals by analyzing their population. she’ll use . the population of this species is decreasing considerably. if this trend doesn’t change, this species will fall under the category of animals. this is a plato question,i need to make up his biology credit.