What is the use of a peacock's tail feathers?
a. to attract a mate
b. they it fly longer distances
c. peacocks use their tails to swim
d. they seep small bugs into piles, making it easier to eat

Fungi are classified into how many groups? a. 1 group b. 2 groups c. 3 groups d. 4 groups

Identify the fungus type pictured below. the image shows a mushroom used often in cooking, will gills underneath its cap.

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