The different seasons of the year are due to the
A. tilt of Earth's axis as it travels around the sun.
B. distance from Earth to the sun.
C. rotation of Earth on its axis.
D. rotation of the moon around Earth.
E. gravitational pull of the moon as it travels around Earth.
A. tilt of Earth's axis as it travels around the sun.
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These biological compounds are non-polar and insoluble in water:
A. proteins B. nucleic acids C. lipids D. carbohydrates
Harold is so sad that for months he can barely get out of bed. If he does, he just sits at the kitchen table with his head on his hands. Yet for a few weeks, about once every four or five months, he reverses mood. He becomes chatty and animated, uncharacteristically spending lavishly. Harold most likely has
A) schizophrenia. B) euphoria. C) bipolar disorder. D) major depressive disorder.
The most common vectors used in DNA therapy experiments are ___________
A. modified human cells D. bacteria B. retroviruses E. naked DNA C. hanta viruses
Most flowers are pollinated by which method?
a. wind b. birds c. bats d. water e. insects