Why are phytoplankton critical for marine life?
A) They are large contribution to marine food webs
B) They generate massive amounts of atmospheric oxygen
C) They are able to bind billions of tons of carbon into carbohydrates
D) All of these choices
D
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What will be an ideal response?
Many large intertidal plants must be slippery in addition to being strong and elastic to avoid being
shredded by the intense wave energy of the intertidal. Indicate whether the statement is true or false.
At the moment of the Big Bang, both ____ and ____ were set at zero
a. matter, energy b. time, space c. nuclear power, weak nuclear forces d. gravity, chemistry e. matter, weak nuclear forces
The Leaning Tower of Pisa leans because
A. the designers wanted it that way. B. the tower was built on unstable clay-rich soils. C. modern construction nearby has disturbed the foundation. D. the structure itself was poorly built.