The plasma membrane is considered a barrier to the environment because no molecules may pass through it it controls the passage of molecules into the cell it is located outside of the cell wall only water and small molecules may penetrate the membrane

Select the true statements about eubacteria. most live as decomposers and heterotrophs. most only thrive in a narrow range of environments. certain eubacteria are responsible for food poisoning. eubacteria thrive in extreme environments.

What are examples of the plant life and animal life that can be found in each type of terrarium

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.