Why would a decrease in the density of the ozone layer create a public health concern?
a. The greenhouse effect would not be as efficient and the temperature of Earth would decrease.
b. The greenhouse effect would be more efficient and the temperature of Earth would increase.
c. Plant life would no longer have the ozone it needs for photosynthesis to create chlorophyll.
d. Ultraviolet radiation from the sun would bombard Earth.
e. none of the above
D
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a. 0 b. 0.25 c. 0.50 d. 0.79 e. 1.0
We often find dark nebulae associated with bright H II regions
Indicate whether the statement is true or false
What's the Big Bang?
a. the creation of the universe b. microwave radiation from all directions in the sky c. the Hubble relation d. a punk rock band
Which describes the direct change in genetic information of a cell?
a. chromosome b. mutation c. evolution d. natural selection e. heredity