THE FACTORS THAT STAY THE SAME IN A EXPERIMENT.

THE FLORA AND FAUNA FOUND ON THE BOTTOM OR IN THE BOTTOM SEDIMENTS OF A OCEAN, LAKE OR OTHER BODY OF WATER.

EXCESSIVE RICHNESS OF NUTRIENTS IN A LAKE OR OTHER BODY OF WATER, DUE TO RUNOFF FROM THE LAND.

ALLOWING LIQUIDS OR GASES TO PASS THROUGH IT

A CHEMICAL COMPOUND THAT'S NEUTRALIZES OR EFFERVESCES WITH ACIDS AND TURNS LITMUS BLUE.

A VARIANT OF A BASIC ELEMENT.

THE APPROXIMATE AGE OR EXACT AGE OF A THING OR PERSON.

THE PROCESS OF GATHERING DATA TO TEST THE ACCURACY.

THE ANALYSIS OF GEOLOGICAL PHENOMENA(VEGITATION,SOIL DEPOSITS,ETC).

A SURFACE OF CONTACT BETWEEN TWO GROUPS OF UNCONFORMABLE STRATA.

THE CONTROLLED EXPANSION OF URBAN AREAS.

KILLING MICROORGANISMS OR SUPPRESSING THEIR GROETH OR MULTIPLICATION.

SHORT HAIRLIKE VIBRATING STRUCTURE

AN AGENT THAT CAUSE GENETIC MUTATION

A QUANTITY HAVING DIRECTION