Plants that live in temperate latitudes often make seeds that exhibit dormancy. What is the advantage of having dormant seeds for plants in these areas?
What will be an ideal response?
Without dormancy, warm autumn temperatures would cause the seeds to germinate. The delicate seedlings would then be killed by cold winter weather.
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Volcanoes release carbon dioxide into the air during an eruption in what form?
a. carbon dioxide b. carbon monoxide c. methane d. ethane
The hosts for the causative agent of cholera between
El Niño Southern Oscillations are a. humans. b. algae. c. copepods. d. shellfish. e. marine worms.
The out-of-Africa model states that Homo sapiens arose from a single population in Africa about
____________________ years ago. Fill in the blank(s) with the appropriate word(s).
What are leaf veins?
A. Vascular bundles in leaves B. Photosynthetic cells in leaves C. Sclerenchyma cells in leaves D. Palisade mesophyll in leaves E. Spongy mesophyll in leaves