Why do humans and other animals have two nostrils?

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Humans evolved from ancestors with bilateral symmetry. Having two nostrils may have been advantageous much as having ears on both sides of the head is, allowing better determination of location of a chemical/food/enemy. Having two nostrils also increases the surface area for olfactory epithelium.

Biology & Microbiology

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Where does the rabies virus reproduce? Using a specific example, explain the implication this has with the virus's incubation time and infection site

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Biology & Microbiology

The boreal forests of North America are dominated

by a. spruce, fir, and pine. b. redwoods and sequoia. c. birch and aspen. d. long-leaf and loblolly pines. e. cedars and junipers.

Biology & Microbiology

What are the problems with cloning as a conservation strategy?Check all that apply.

A. Populations of cloned individuals grow too quickly. B. The root causes of species loss are not addressed by cloning methods. C. It often requires finding appropriate surrogate mothers. D. It requires detailed knowledge of species' reproductive biology. E. It increases genetic diversity of a species beyond natural levels.

Biology & Microbiology

At the cellular level, photosynthesis occurs within

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Biology & Microbiology