Evolution .
a. must happen, due to organismsâ innate desire to survive.
b. must happen whenever a population is not well-adapted to its environment.
c. requires the operation of natural selection.
d. requires that populations become better suited to their environments.
e. can happen whenever any of the conditions for Hardy-Weinberg equilibrium are not met.

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answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.