In the caste system, the ________ perform the dirtiest, most polluting jobs
A) Brahmins
B) Mughals
C) dalits
D) Sikhs
C
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Where does most evaporation of moisture to the atmosphere occur?
A. from vegetation on the land surface B. from the oceans C. from freshwater streams and lakes
Cold water can dissolve more CO2 than warm water
Indicate whether the statement is true or false
A ___________ species is one that affects many other organisms in an ecosystem
Fill in the blank(s) with correct word
Which of these is NOT always true of fuel cells and hydrogen as a fuel source?
a. Making hydrogen does not produce greenhouse gases. b. Water and heat are the only waste products from an operating fuel cell. c. We will not run out of sources from which to get hydrogen. d. Fuel cells only require a source of hydrogen and oxygen from the air to work.