If the number of trees on earth continues to decrease significantly, what might be the result? a. less oxygen released into the atmosphere and more co2 buildup; erosion could occur without the tree roots to hold the earth in place; loss of habitat of many animals and diversity could decrease b. balance of nitrogen and phosphorus in the ecosystem and the movement of water through the ecosystem could be thrown out of balance c. a and b d. none of the above

Suppose a point mutation, such as a change from an adenine to a guanine, occurs in the genome of a human sperm cell. the mutation could occur in any region of a gene. the effect of the mutation on the phenotype of the offspring will be determined by where the mutation occurs and its effect on the final gene product. in which of the following scenarios could the mutation alter the phenotype of the offspring? select all of the scenarios that apply the mutation occurs in the promoter and affects the rate of gene transcription. the mutation results in a new, dominant allele the mutation occurs in a portion of an intron not responsible for exon splicing the mutation occurs in a gene that controls development and alters differentiation of a cell type during development. the mutation occurs in a codon and alters the function of the final protein e mutation occurs in a codon, and the amino acid sequence of the final protein is unchanged.