Eventually , the virus is activated and enters the .

fill in the blank pl !!

What have we learned from fossil evidence about evolution? a) it is an abrupt change. b)the process is observable. c) it takes place during one lifetime only. d)the most complex traits are always selected.

Witch type of microscope is used to view very small cell components like proteins and dna?

What substance acts to prevent sudden ph changes in bodily fluids?