B, if it ever went to zero they would be extinct and they repopulated over time so you know it got close but never hit zero
The endocrine system or the skin (:
Answer: A Tool that Shows Phenotypes of Genetically Related family Members, Are A pedigree.
Explanation:
All types of blood can accept it
Answer:
c and b
Explanation:
cause I believe that because of the populations and polutions that is cause of humans we are now lack of protective shield and green gases within our atmosphere
