What major agricultural innovation in the early twentieth century allowed for production of far more food on arable land?
A) genetically modified crops
B) concentration of carbon fertilizer
C) industrial nitrogen fixation
D) use of fish as fertilizer
E) the discovery of crop rotation
Answer: C
Biology & Microbiology
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Where did Homo sapiens evolve?
A. Asia B. Middle east C. Africa D. independently in multiple regions of the world E. North America
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The probable extinction of the ivory-billed woodpecker was mainly driven by
A. direct exploitation. B. introduced species. C. habitat destruction. D. climate change. E. genetic drift.
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What is the only group of mammals that is classified as eusocial?
a. Naked mole rats b. Termites c. Dolphins d. Humans e. Gorillas
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The letter “C” from the above figure represents
a. ectoderm. b. endoderm. c. mesoderm. d. neural plate. e. all of these.
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