(physics, chemistry) A conservation law of classical physics that states that the total mass of a closed system remains constant regardless of the chemical or physical changes that take place within it.

(biology) Legal aspects of protection of biodiversity, the environment, and natural resources.

One who favors a balanced budget, preferring spending cuts or tax increases to borrowing, and wants to decrease government size, and promote a free market.

(politics) Alternative form of Conservative Party

(US, Canada) One who favors a specific set of social policies, generally including opposition to birth control, abortion rights, euthanasia, same-sex marriage, and sexual permissiveness, often based on a particular reading of Christian values.

Protection of the soil against sediment loss by erosion or fertility loss due to degradation. / A combination of all soil management and land use methods that protect against degradation.

A DNA or protein sequence with a high degree of sequence identity to other sequences in that species, or in others.

(medicine) A treatment that does not include any operation or intervention.

(genetics) A model of DNA replication that leaves intact the original DNA molecule.

(biology) The scientific study of the state of Earth's biodiversity with the objective to protect it from becoming extinct.