What do populations living at high elevations have to adapt to? A) lower ultraviolet light intensity.

B) higher average temperatures.

C) lower oxygen levels.

D) higher heart rates among children.

c lower oxygen levels

Explanation:

the higher up the person is the closer to the atmosphere so there is less oxygen

the answer is: trichonympha lives in the gut of termites and digests cellulose eaten by the termite.

this is an example of a symbiotic association of a protozoan with its mode of association.

hope i

-lavira: )