Meanings

preservative

law of conservation of energy

dependence effect

relict (species)

law of conservation of momentum

to know

to know (someone)

existence (of natural resources)

reserves (of oil, natural gas, etc.)

dissolved oxygen

dissolved

codependence

the fate of a nation

question of maintenance or abolition (of an institution, organization, etc.)

independence and self-reliance

to exist

(sense of) presence

cold storage

preserved foodstuffs

preservation