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An organism's sex is female (symbol: ♀) if it produces the ovum (egg cell), the type of gamete (sex cell) that fuses with the male gamete (sperm cell)...

The moose (pl.: 'moose'; used in North America) or elk (pl.: 'elk' or 'elks'; used in Eurasia) (Alces alces) is the world's tallest, largest and heaviest...

Symbiosis (from Greek συμβίωσις, symbíōsis, "living with, companionship, camaraderie", from σύν, sýn, "together", and βίωσις, bíōsis, "living") is any...

Insulin (/ˈɪn.sjʊ.lɪn/, from Latin insula, 'island') is a peptide hormone produced by beta cells of the pancreatic islets encoded in humans by the insulin...

Pea (Pisum in Latin) is a pulse, vegetable or fodder crop, but the word often refers to the seed or sometimes the pod of this flowering plant species,...

Ploidy (/ˈplɔɪdi/) is the number of complete sets of chromosomes in a cell, and hence the number of possible alleles for autosomal and pseudoautosomal...

The areca nut (/ˈærɪkə/ or /əˈriːkə/) or betel nut is the fruit of the areca palm (Areca catechu), which grows in much of the tropical Pacific (Melanesia...

The loquat (Eriobotrya japonica, Japanese: 枇杷, biwa) is a large evergreen shrub or tree grown commercially for its orange fruit and for its leaves, which...

Condor is the common name for two species of New World vultures, each in a monotypic genus. The name derives from the Quechua kuntur. They are the largest...

Glycoproteins are proteins which contain oligosaccharide chains covalently attached to amino acid side-chains. The carbohydrate is attached to the protein...

Sensory neurons, also known as afferent neurons, are neurons in the nervous system, that convert a specific type of stimulus, via their receptors, into...

Sexual abstinence or sexual restraint is the practice of refraining from sexual activity for medical, psychological, legal, social, philosophical, moral...

The 5-HT2C receptor is a subtype of the 5-HT2 receptor that binds the endogenous neurotransmitter serotonin (5-hydroxytryptamine, 5-HT). Like all 5-HT2...

The alligator snapping turtle (Macrochelys temminckii) is a large species of turtle in the family Chelydridae. The species is endemic to freshwater habitats...

Chemotaxis (from chemo- + taxis) is the movement of an organism or entity in response to a chemical stimulus. Somatic cells, bacteria, and other single-cell...

The European water vole or northern water vole (Arvicola amphibius), is a semi-aquatic rodent. It is often informally called the water rat, though it only...

Myoglobin (symbol Mb or MB) is an iron- and oxygen-binding protein found in the cardiac and skeletal muscle tissue of vertebrates in general and in almost...

The olfactory bulb (Latin: bulbus olfactorius) is a neural structure of the vertebrate forebrain involved in olfaction, the sense of smell. It sends olfactory...

Lovebird is the common name for the genus Agapornis, a small group of parrots in the Old World parrot family Psittaculidae. Of the nine species in the...

The reticular formation is a set of interconnected nuclei that are located in the brainstem, hypothalamus, and other regions. It is not anatomically well...