Why is fiber necessary for the proper functioning of the digestive system?

Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?

To maintain asepsis when administering an injection, all parts of the syringe can be handled except the:

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population. b) the separated population is small, and genetic drift occurs. c) the isolated population is exposed to different selection pressures than the ancestral population. d) different mutations begin to distinguish the gene pools of the separated populations. e) gene flow between the two populations is extensive.