Which natural event produces oxygen, which can then be used by humans and other organisms?

a. evaporation of water

b. respiration by consumers

c. photosynthesis by producers

d. chemosynthesis of sulfide

The approximate percentage of Earth's freshwater contained in glaciers is 3 percent. 31 percent. 69 percent 98 percent.

Why is it more difficult to estimate heritability in humans than in livestock or laboratory animals?

A few of the presenters in the course discussed the three steps toward reducing our dependence on fossil fuels. These steps should be followed on both an individual and national basis, even for transportation.

A student inoculates a gelatin tube and places it at 37C for the week. When he comes back he takes the tube out of the incubator and notices that the media is liquid. He concludes that the bacterium is gelatinase positive.

Explain how you could determine which individuals were heterozygous by looking at the gel

Which organism's are omnivores? A) The snake, the bear, and the fish B) The fish and the eagle C) The bear and the fish D) The snake and the mouse If an omnivore is an animal that eats both plants and animals, I'd choose D because all the other

How are all humans similar?

Why does earth have such a diversity of plant and animal life? give three reasons.

After sequencing a molecule of dna, you discover that 20% of the bases are cytosine. what percentage of the bases would you expect to be thymine? explain why.

Kidneys that can conserve water are essential to homeostasis because: a) some animals live in dry or salty environments. b) some animals drink water.