Down syndrome occurs when an individual has a mutation of chromosome 21. In what organelle does this mutation occur? A)cell wall B)genes C)mitochondria D)Nucleus

B

Explanation: A chromosome is a long strand of DNA.  Your DNA is the sequence that holds the "info" to make a gene.

the dark variety, as they are not visible on the dark tree barks

explanation:

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation: