A cell theory.
Since cells are the basic unit of structure in all organisms and also the basic unit of reproduction.
Answer:
a is the answer the the following question
Forward spatter is the blood that is ejected out of the exit wound,going the same direction as the bullet.back spatter is the blood ejected out of the entry wound,travelling against the line of fire and towards the shooter.
Populations tend to grow because of repopulation.
