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Threshold frequency is the minimum frequency needed by a radiation to dislodge an electron from a given surface.
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.