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69 or sixty-nine is a sex position in which two people align themselves so that each person's mouth is near the other's genitals so that each partner can...

Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined...

Extinction is the termination of a taxon by the death of its last member. A taxon may become functionally extinct before the death of its last member if...

Paleontology (/ˌpeɪliɒnˈtɒlədʒi, ˌpæli-, -ən-/ PAY-lee-on-TOL-ə-jee, PAL-ee-, -⁠ən-), also spelled palaeontology or palæontology, is the scientific study...

Common lichen growth forms A lichen (/ˈlaɪkən/ LY-kən, UK also /ˈlɪtʃən/ LITCH-ən) is a hybrid colony of algae or cyanobacteria living symbiotically among...

In biology, a mutation is an alteration in the nucleic acid sequence of the genome of an organism, virus, or extrachromosomal DNA. Viral genomes contain...

The Maine Coon is a large domesticated cat breed. One of the oldest natural breeds in North America, the breed originated in the U.S. state of Maine, where...

Promiscuity is the practice of engaging in sexual activity frequently with different partners or being indiscriminate in the choice of sexual partners...

The Bulldog is a British breed of dog of mastiff type. It may also be known as the English Bulldog or British Bulldog. It is a medium-sized, muscular dog...

Prairie dogs (genus Cynomys) are herbivorous burrowing ground squirrels native to the grasslands of North America. There are five recognized species of...

Black pepper (Piper nigrum) is a flowering vine in the family Piperaceae, cultivated for its fruit (the peppercorn), which is usually dried and used as...

The Rottweiler (/ˈrɒtwaɪlər/, UK also /-vaɪlər/, German: [ˈʁɔtvaɪ̯lɐ] ) is a breed of domestic dog, regarded as medium-to-large or large. The dogs were...

In molecular biology, messenger ribonucleic acid (mRNA) is a single-stranded molecule of RNA that corresponds to the genetic sequence of a gene, and is...

The Dobermann is a German breed of medium-large working dog of pinscher type. It was originally bred in Thuringia in about 1890 by Louis Dobermann, a tax...

Nucleotides are organic molecules composed of a nitrogenous base, a pentose sugar and a phosphate. They serve as monomeric units of the nucleic acid polymers...

The embryophytes (/ˈɛmbriəˌfaɪts/) are a clade of plants, also known as Embryophyta (/ˌɛmbriˈɒfətə, -oʊˈfaɪtə/) or land plants. They are the most familiar...

Asparagus (Asparagus officinalis) is a perennial flowering plant species in the genus Asparagus native to Eurasia. Widely cultivated as a vegetable crop...

Cloning is the process of producing individual organisms with identical genomes, either by natural or artificial means. In nature, some organisms produce...

A plasmid is a small, extrachromosomal DNA molecule within a cell that is physically separated from chromosomal DNA and can replicate independently. They...

The Australian Shepherd is a breed of herding dog from the United States. The name of the breed is technically a misnomer, as it was developed in California...