How does mutation change allele frequency A. It forces evolution to happen by introducing new adaptions.

B. It causes some individuals to go extinct because their mutations hurt their chance of survival.

C. It adds new genes into the gene pool that didn't exist there before.

Explanation:

Mutations add new alleles into a gene pool. This causes a change in the frequency of certain allele combinations in the population, which will cause the population to evolve over time. They are a major evolutionary force that creates new gene variations.

from my research i have to the conclusion that decomposers, such as fungi, bacteria and invertebrates, play a critical role in nutrient cycling and without them the earth's ecosystem may not support life as we know it. elements such as carbon, nitrogen and phosphorus exist in limited amounts on earth, although huge amounts of carbon are being released into the atmosphere from underground sources now by humans. it is still extremely important that other nutrients be retained by the process of re-use. decomposers are organisms that are able to chemically break down dead material and make these elements available for use by other organisms. without this breakdown of dead material, dead bodies would pile up. so decomposers also play a role in clean up also. without them, life might not continue as we know it and dead material would overwhelm the earth.    

phylogenetic tree is the tree of life or evolution tree. it shows the different branches of evolution. the sequence goes like tissues - coelom - backbone - endoskeleton - segmentation