The bushes have alleles for blue and red berries. Bushes with both red and blue alleles make purple berries. If the birds only like to eat blue berries, what is the selective pressure the birds are putting on the bushes?
For more plants to have red
berries.
For more plants to have purple
berries.
For more plants to have blue
berries.
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Waste water from industries and domestic sources can be treated by chlorination or ultraviolet radiation. there are pros and cons to using either chlorine or uv radiation to kill harmful microorganisms. what is one reason chlorination would be preferred over ultraviolet radiation? a) chlorine only eliminates visible impurities and is ineffective against microorganisms. b) chlorine not only kills bacteria but provides a residual effect on returning microorganisms. c) uv radiation can be used only to treat drinking water and is ineffective in treating waste water. d) ultraviolet radiation is more effective