Answer:
D. Stem cells are often extracted from human embryos.
Explanation:
This is a major point of ethical concern and is also a root for many abortion conspiracy theories. The reason it is an ethical concern is because harvesting stem cells often times kills the embryo.
Both because they have to have a host to feed on
Answer:
Pressure :)))))))........
I believe the answer is the primitive organic molecules were formed in an oxidizing atmosphere in the primordial soup.