What is shown in this illustration?
a) sister chromatids with different genes
b) homologous chromosomes with homozygous alleles
c) homologous chromosomes with heterozygous alleles
d) heterozygous chromosomes with homozygous alleles

b not sure.

Explanation:

I dont know what does the illustration say, maybe post the illustration as well maybe I would be able to help you.

burning of wood and coal

explanation:

the panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in earth's temperatures over the past 50 years.

a- all cells come from pre-existing cells