When have many deciduous plants adapted to drop their leaves?

A) when overwatered
B) during summer
C) during droughts
D) whenever daylight cycles shorten


C

Biology & Microbiology

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____ must have been the first eukaryotic cells

a. Archaea b. Bacteria c. Protists d. Fungi e. Microplants

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Nutrient deficient aquatic ecosystems are called ________.

A. hypotrophic B. oligotrophic C. eutrophic D. autotrophic E. epitrophic

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Parapatric speciation occurs most often ____.

A. within in the same home range B. populations inhabiting different areas while maintaining contact along a common border C. within a group of interbreeding populations D. on either side of geographic barriers E. by polyploidy

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The response of plants to touch is known as

A. phototropism. B. thigmotropism. C. gravitropism. D. photoperiodism.

Biology & Microbiology