In the Gulf of Mexico, red tides caused by the dinoflagellate Karenia brevis cause massive fish kills as well as respiratory problems in humans. As an environmental scientist, what would you suggest concerned citizens do to help prevent these red tides?
A. Encourage sustainable fishing
B. Participate in beach cleanup efforts
C. Purchase fuel-efficient vehicles
D. Reduce fertilizer use on lawns and gardens
E. Decrease the amount of artificial light in coastal areas
Answer: D
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The nucleotides called pyrimidines include
A. uracil and cytosine. B. uracil and thymine. C. thymine and cytosine. D. thymine and adenine. E. cytosine and guanine.
Where is most the Earth’s phosphate found?
a. ocean water b. aquifers c. the atmosphere d. rocks and sediments e. plants
In a study of ponds and nearby terrestrial ecosystems, Tiffany Knight and colleagues showed that the presence of fish in ponds had indirect, positive effects on the seed set of terrestrial plants. In particular, fish exerted this influence through their direct, negative effects on which organisms?
A) larval dragonflies B) adult dragonflies C) insect pollinators of plants D) plants
To survive successfully on land, plants needed to develop
A) the ability to use oxygen. B) methods to prevent water loss. C) internal skeletons. D) photosynthesis. E) swimming sperm.