How does a mutation change an organism? When do such mutations occur?

Sometimes, before the cell divides, a mistake made in the DNA is copied to make a new set of chromosomes. This is called mutation. If a mutation occurs during the formation of sex cell, an offspring that results from that sex cell will be affected by the mutation. Even though some mutations don't make a difference and some are even helpful, many mutations are harmful because they can change the instruction of the gene.

Explanation:

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

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.