Answer the following questions
a. Over time, pressure and heat transformed the compacted organic remains of Carboniferous forests into ____.
b. Ancient relatives of ____ and ____ dominated in the Carboniferous forests.
a. coal
b. horsetails and lycophytes
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Many human activities influence the amount of CO2 in the atmosphere. Why? Select all that apply
A. Logging removes trees that would otherwise use CO2 during photosynthesis. B. Burning vegetation (to make way for croplands) releases CO2 into the atmosphere. C. Using fossil fuels to power vehicles releases CO2 into the atmosphere. D. There is no evidence that human activities contribute to atmospheric CO2 levels.
The function of DNA ligase in recombinant technology is to
A. carry DNA into a new cell. B. cut DNA into many fragments. C. seal DNA into an opening created by restriction enzymes. D. separate fragments of DNA by their length and electrical charges. E. make millions of copies of a specific segment of DNA.
Since snakes, people, and fish all like to eat frogs, this is an example of a
A. food web. B. food chain. C. preference test. D. trophic level variation.
Once a river is polluted, it is impossible for it to recover.
Answer the following statement true (T) or false (F)