Rocks carried by a river smash together and break into smaller pieces. what does this describe?

Eristics do scientists use to distinguish between organisms in different kingdoms

What must happen before meiosis can begin? a. four gametes must be produced b. the four tetrads must be pulled apart c. dna doubles and produces sister chromatids d. the cell membrane pinches together

Amouse that is homozygous for the dominant trait has the genotype . it has . a mouse that is homozygous for the recessive trait has the genotype . it has . image of fur color of mice