M.KHANJohnson C. Smith University
which of the following statements accurately describes nuclear fusion reactors?
a) Fusion reactions require very high temperature
b) Nuclear fusion occurs in Earth's crust.
c) Fusion reactions can fuse three isotopes of hydrogen into one helium.
d) Fusion would be a more advanced technology if governments had provided some money for research or if attempts to develop it were more than just a few years old.
Which of the following statements is not a characteristic or effect of climate change?
a. Global warming is the only type of climate change.
b. Climate change is beginning to re-draw the map of biomes around the world.
c. Climate change is occurring because the biotic and abiotic parts of ecosystems are not static.
d. Climate change is any substantial change in climate that lasts for an extended period of time.
e. Climate change will likely exceed the ability of many species to adapt and could cause many species to go extinct.
Which of the following statements is true of trophic levels in an ecosystem?
a) Food chains are accurate representations of dynamics in an ecosystem.
b) In terrestrial ecosystems, primary producers commonly eat plants.
c) Food webs are easier to interpret than food chains.
d) The least amount of energy is available at the top of a food chain.