Streams can lengthen their drainage courses by the process of headward erosion
Indicate whether the statement is true or false
T
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When organisms die, their nitrogenous organic compounds are converted to simpler inorganic compounds such as ammonia through the process of
a. Nitrification b. Ammonification c. Denitrification d. Assimilation e. Leaching
The reason that Earth is now closest to the Sun in January, but will be closest in July in 11,000 years,
is: a. orbital eccentricity. b. changes in axial tilt. c. precession of the equinoxes. d. gravitational attraction to the sun. e. gravitational attraction to the moon.
During photosynthesis, how many molecules of oxygen are produced for each molecule of glucose which is synthesized?
A) 1 B) 3 C) 6 D) 12
A pair of protons in an atomic nucleus repel each other, but they are also attracted to each other. Why?
A. The pair repel each other by nuclear force but attract one another by an electrical force. B. Although it is known that protons repel each other at short distances because of like charge, it is not known what actually holds protons together in the nucleus because we have never seen the nucleus of an atom. C. The pair attract each other by nuclear force but also repel one another by a weaker electrical force. D. The pair repel each other since they are both positively charges but they are held together by much stronger forces known as quarks.