The angle at which the Sun's rays strike the Earth has a great effect on
A. the intensity of solar energy received at Earth's surface.
B. Earth's seasons.
C. the way climate varies with latitude.
D. all of the above
Answer: D
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Which of the following gases is produced naturally in the stratosphere and is also a primary component of photochemical smog in polluted air at the surface?
A. carbon dioxide B. nitrogen dioxide C. ozone D. carbon monoxide
A person on the edge of a roof throws a ball downward. It strikes the ground with 100 J of kinetic energy. The person throws an identical ball upward with the same initial speed, and this too falls to the ground
Neglecting air resistance, the second ball hits the ground with a kinetic energy of A) 100 J. B) 200 J. C) less than 100 J. D) more than 200 J. E) none of the above
It is estimated that more than one-fourth of children lack measles immunization in South Asia and Sub-Saharan Africa
Indicate whether the statement is true or false.
What are small molecules composed of multiple amino acids called?
A)monomers B)protobionts C)bacteria D)proteinoids E)DNA