When fossil fuels and biofuels are burned, the stored energy in what substance is related to generate electricity? a) neutrons
b) geothermal heat
c) sunlight
d) organic matter

Question#29: why does the tropical ocean have a greater temperature range than the temperate ocean?

What is the identity of the planets?

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled