What role does skin play in the excretory system?

a. secretes excess water as sweat

b. protects against pathogens

c. absorbs water through osmosis

d. facilitates gas exchange

Researchers want to use edna to look for an invasive species in the water which of the steps would be likely do last

During convection, less dense fluid rises and denser fluid sinks.

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.