Earth is generally hotter at the equator because:
A) the sun shines over the equator evenly through the year, rather than seasonally.
B) Earth's rotation on a tilted axis creates an atmospheric drag at the equator, warming the air.
C) the Earth receives the most direct sunlight over the course of the year at the equator.
D) Earth's rotation on a tilted axis increases seasonality.
E) the natural oval shape of Earth places the equator nearer the sun than the poles.
Answer: C
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bio refers to a gene that governs a cell's ability to synthesize biotin from inorganic precursors. The
designation bio+ indicates:
a. that the allele is normal. b. that the allele is the mutant allele. c. that the bacterium is biologically active. d. that the bacterium is biologically inactive. e. that the bacterium cannot make its own biotin.
Which statement about biodiversity is true?
a. Biodiversity facilitates human survival. b. Biodiversity is measured with one method. c. Biodiversity decreases closer to the equator. d. Biodiversity is distributed evenly around the world.
The "blind spot" is the point in the eye where the
a. lens is attached by ligaments. b. choroid attaches to the retina. c. cornea attaches to the sclera. d. optic nerve exits the eye. e. iris attaches to the sclera.
The products of Hox genes act as:
A: segment polarity genes. B: transcription factors. C: morphogens. D: hormones. E: gap genes