The lineage that produced chimpanzees and humans split from other primates roughly 30 million years ago. chimpanzees' skulls have the following features: trait a, found in fossils as old as 10 to 12 million is molars with thick enamel. trait b, found in fosssils as old as 55 million years, is a postorbital wall that ventrally separates the orbit from the temporal fossa. which of the following statements is true?

a. trait a is more beneficial for chimpanzee survival because it is newer.
b. trait b is more beneficial for chimpanzee survival because it is older.
c. trait a is more likely to be widespread among other primate species because it is newer.
d. trait b is more likely to be widespread among other primate species because it is older submit

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.    

what school and grade?