Rank the following types of water on earth, from lowest salinity to highest salinity.
a) salt water; brackish water; fresh water
b) fresh water; brackish water; salt water
c) fresh water; salt water; brackish water
d) salt water; fresh water; brackish water

Why does meiosis produce cells with half the chromosomes? o a. most of the chromosomes are not necessary to keep an organism alive. b. a gamete needs only half the number of chromosomes because two gametes join together. o c. it makes the gametes easier to move around in the organism. o d. it is faster to produce gametes with fewer chromosomes.

Which greenhouse gas is emitted when burn fossil fuels for energy? a.nitrogen b.oxygen c.carbon dioxide d.helium

How and why organisms are hierarchically classifies