Birds have been observed puffing up their feathers under certain conditions. By trapping air between feathers, this behavior helps the bird
A. hide from enemies
B. expend less energy during flight
C. shelter offspring
D. trap body heat
Answer: D. trap body heat
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The above figure is a photograph of
a. a plant with root nodules. b. mycorrhizae. c. root hairs. d. a demonstration of the effect of mutualistic Rhizobium. e. a microscopic view of a nodule forming around area where the bacterium infect.
Why might bacteria be considered more successful than humans?
A) Humans are resistant to bacterial infections. B) Bacteria have very specialized food sources. C) Bacteria have been evolving for billions of years. D) Bacteria are less diversified than humans.
The first recognized vascular plant fossil was derived from the extinct genus ________, which had leafless stems with simple, forked branches of equal size.
A. Lycopodium B. Cooksonia C. Marchantia D. Equisetum E. Spirogyra
Final phase of mitosis; daughter cells are located at each pole.
What will be an ideal response?