Of all the water on earth, what is the percentage of drinkable freshwater? a) 97% b) 0.69% c) 23% d) 77%

This is one form of rna that transports a specific amino acid to a ribosome during protein synthesis.

Models are non-visual ways of coummincating how someone thinks about something in the natural world

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.