a period of time marked by distinctive character, events.

the act of extinguishing.

UBIQUITOUS ONE-CELLED ORGANISMS, SPHERICAL, SPIRAL, OR ROD-SHAPED AND APPEARING SINGLY OR IN CHAINS, COMPRISING THE SCHIZOMYCOTA, A PHYLUM OF THE KINGDOM MONERA (IN SOME CLASSIFICATION SYSTEMS THE PLANT CLASS SCHIZOMYCETES), VARIOUS SPECIES OF WHICH ARE INVOLVED IN FERMENTATION, PUTREFACTION, INFECTIOUS DISEASES, OR NITROGEN FIXATION.

A PERSON OR THING THAT CARRIES.

the science of gathering data on an object or area from a considerable distance, as with radar or infrared photography, to observe the earth or a heavenly body.

an extremely long macromolecule that is the main component of chromosomes

A CENTRAL PART ABOUT WHICH OTHER PARTS ARE GROUPED OR GATHERED; CORE: A FEW FAITHFUL FRIENDS FORMED THE NUCLEUS OF THE CLUB.

ANY OF A LARGE GROUP OF CHEMICAL SUBSTANCES, AS PENICILLIN OR STREPTOMYCIN, PRODUCED BY VARIOUS MICROORGANISMS AND FUNGI, HAVING THE CAPACITY IN DILUTE SOLUTIONS TO INHIBIT THE GROWTH OF OR TO DESTROY BACTERIA AND OTHER MICROORGANISMS, USED CHIEFLY IN THE TREATMENT OF INFECTIOUS DISEASES.

A MICROORGANISM, ESPECIALLY A PATHOGENIC BACTERIUM.

ANY OF A DIVERSE GROUP OF EUKARYOTES, OF THE KINGDOM PROTISTA, THAT ARE PRIMARILY UNICELLULAR, EXISTING SINGLY OR AGGREGATING INTO COLONIES, ARE USUALLY NONPHOTOSYNTHETIC, AND ARE OFTEN CLASSIFIED FURTHER INTO PHYLA ACCORDING TO THEIR CAPACITY FOR AND MEANS OF MOTILITY, AS BY PSEUDOPODS, FLAGELLA, OR CILIA.