Which of the following is an example of a common ecosystem service?
A. Earthworm eat leaves and defecate deep in their burrows.
B. Decomposer bacteria and other organisms cause leaves to decompose on the forest floor.
C. People enjoy seeing wildlife.
D. All of the statements are correct.
E. None of the statements are correct.
Answer: D
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Why might the following nuclear reaction not be very good for energy production in a fission reactor? Fe ? Si + Mg + 3 neutrons
A) The material only produces a few neutrons so the chain reaction will not be very efficient. B) The reactants are too small to obtain energy from the missing mass due to strong nuclear force. C) The products are not the right size to obtain much energy from the missing mass due to the strong nuclear force. D) The mass of the byproducts is too high and therefore the energy released will not be high enough. E) Interatomic attraction between the products will impede the separation of the atoms from the unstable nuclei.
What are ventifacts? How are multiple facets formed on ventifacts? Where are they found What will be an ideal response?
Which of the following reactions involves the addition of two equivalent groups to the two ends of a double bond?
A) bromination B) hydrogenation C) both a and b D) neither a nor b
In the diagram below, the red arrows represent
A. fluxes that have little environmental impact. B. fluxes that are constant across time. C. human-influenced fluxes. D. fluxes that are increasing over time.