The controversy mostly originates from that fact that the studied embryonic stem cells come from human embryos, which raises a lot of ethical questions among people.
Answer:
B. chemical energy
Explanation:
kinetic energy is moving energy, which has nothing to do with plants
mechanical energy has nothing to do with organic life
hydroelectric energy is energy made from presser which is not made from plants
Answer:
It is a learned behavior.
Explanation:
Typically, tool use implies a complex behavior that requires training and observing someone else who already has that particular ability. Thus, this ability shall be learned by one generation from the previous one, which shows and teaches this behavior to the next one.