All of the stars we see at night with our unaided eyes are within
A. 10,000 light-years, which is a small portion of our galaxy.
B. 14 billion light-years, which encompasses the observable universe.
C. 100,000 light-years, which encompasses most all of our galaxy.
D. 5 million light-years, which encompasses our local group.
Answer: A
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Vascular plants having flowers and seeds are called ____
a. ostracoderms b. spores c. angiosperms d. gymnosperms e. therapsids
Describe the distinction between a primary pollutant and a secondary pollutant. Give an example of a primary pollutant and an example of a secondary pollutant. Explain the source(s) and effect(s) of each of these pollutants, and describe recent U.S
trends in atmospheric concentrations of each.
Pumping ancient groundwater faster than it is being replenished is called ____
a. water recharge b. aquicluding c. water mining d. subsidence
Which type of breaker has a longer life span and give surfers a longer ride than other breakers?
A) Plunging breaker B) Spilling breaker C) Standing breaker D) Surging breaker E) Swelling breaker