Natural processes such as speciation and gradualism provide the genetic basis for a. evolution
C. biogenesis
b. spontaneous generation
d. sexual reproduction

A. Evolution

Explanation:

Natural processes like speciation create variation in species, making them have biodiversity and a diverse gene pool.

Gradualism also allows for species to change gradually over time.

Both of these processes allow for evolution to occur, as speciation can create more favorable traits that will be passed down with the process of gradualism.

So, the correct answer is A, evolution.

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.