The following statements about tundra are not true except
a. the tundra has a dense covering of trees.
b. there are two main categories of the tundra biome.
c. temperatures in the tundra range from extreme highs to extreme lows.
d. the tundra biome does not support animal life.

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation:

it would lead to upper respiratory infections and pneumonia.

atp is used for energy.