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.

a community that experiences major changes undergoes progress

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it

examples of nucleic acids are deoxyribonucleic acid (dna) and ribonucleic acid (rna).

the principle of segregation describes how pairs of gene variants are separated into reproductive cells. from his data, mendel formulated the principle of segregation. we now know that the segregation of genes occurs during meiosis in eukaryotes, which is a process that produces reproductive cells called gametes.