Which are characteristics of epithelial cells? Select two options. are unable to be used for secretion of materials
main cells of the nervous system
found lining many areas that contact the external environment
plays a role in protection
carry oxygen through the body
make up the skeletal muscle

Aristotle classified animals according to their a. habitat and mating behavior c. mating behavior and relatedness b. habitat and physical differences d. physical differences and mating behavior

To calculate the molarity of a solution, you need to know the moles of solute and the

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