What are damages or changes to a DNA sequence called?
A:Carcinogen
B:Mutation
C:Mutagen
D:Adaptation

If a cell is placed into a hypertonic environment,what will happen to it ? a)it will shrink or shrivel b)nothing c)it will burst d) it will expand or enlarge

Methane gas created by a cows flatulence especially in a large herd is a greenhouse gas. true or false.

Which line in the graph above best illustrates an effect of the carbon dioxide level in the blood on breathing rate before, during and after a period of exercise? 1.b,2.c,3.a,4.d