C. directional selection
True
Sorry, I don't know the second one.
Cause now afays climate changes very fast and more technologies hot advanced
An insulating plate, such as plastic, tends to be positively charged when rubbed with cloth due to the piezoelectric effect. This phenomenon involves certain materials to generate charged particles as a response to mechanical stress applied to it. In this case, the mechanical stress was due to the rubbing motion.
Assuming that you're talking about a food pyramid in the ecosystem,
the best explanation for the decrease in the amount of energy transferred to each succeeding level is that much of energy is : released as heat
Hope this helps
