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Difference between convergent and divergent evolution is;Convergent evolution is where structures with different ancestral origins modify to perform similar functions due to occupation of same environment while divergent is where structures of similar origin are modified to perform different functions.
Difference between oceans and seas is;Oceans are vast body of saline/salty water on the earth's surface that surrounds the land or continent while seas are large water bodies surrounded by land but lack connection/outlet with the oceans.
Operational difference between external circlip and an internal circlip is;An external circlip fits into a groove on the outside of a shaft and is so made that it tends to contract in diameter while an internal circlip fits into a groove on the inside of a hole and is so made that it tends to expand and increase its diameter.
Difference between linkage and sex linked genes is;Linkage - genes are located on the same(locus) on a chromosome and thus are inherited together.Sex-linked - Genes are located on the same sex chromosome and are transmitted together with those that determine sex.
Permanent change is irreversible and new substance is formed while temporary change is a change which can easily be reversed and in which no new substance is formed.