What is the likely long-term consequence of an increase in the relative percent of greenhouse gases in earth’s atmosphere?
a. earth’s average temperature will increase.
b. earth’s average temperature will decrease.
c. earth will experience greater temperature extremes.
d. earth’s average temperature will be unaffected.

Which statement best describes the relationship between an allele and a gene? question 1 a. an allele is a variation of a gene that can be expressed as a phenotype. b. an allele is the part of a gene that attaches to messenger rna molecules. c. an allele is a segment of a dna molecule that controls replication of a gene.

Which is not a characteristic of bacteria? a. they are unicellular. b. they are prokaryotic. c. they are the smallest form of life on earth. d. they are multicellular.

Do plant cells perform cellular respiration?