3. The variance in a gene, which occur on a fixed spot on a chromosome is called
a/an
A. Allele
B. Cell
C. Centromere
D. Nucleus

Allele

Explanation:

one of the most common forms of pain or discomfort we feel during strenuous exercise is a burning sensation in our lungs or muscles that goes away shortly after we cease the activity. this is caused by a build-up of lactic acid.

good thing- during decomposition the organic molecules in organic matter are broken down into simpler organic molecules that require further decomposition or into mineralised nutrients

bad thing- it can be harmful in crop productivity