(Q).
Q: What is the main source of hydrocarbons? Choices: - photosynthesis - greenhouse gases - decomposers - fossil fuels A:
(A).
fossil fuels

(Q).
Q: Animals that do not have internal control of their body temperature are called what? Choices: - athermal - photophores - cold-blooded - ectotherms A:
(A).
ectotherms

(Q).
Q: Which body system controls all the others by sending electrical messages? Choices: - the localized system - the specialized system - the endocrine system - the nervous system A:
(A).
the nervous system