Sally and maria hypothesized that earthworms lived only in dark, damp places. they measured a one-meter square in a shady spot near a stream. they dug through the soil and collected earthworms. they collected 43 worms. they repeated the experiment in several locations, sunny and dry included. they found the most worms in the shady, damp plot near the stream. several other groups of science students carried out the same experiment and got similar results. this is an example of
a) bias.
b) repetition.
c) replication.
d) validity.

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.