Search Results for: mammal
Mammalian Ancestors
Humans are mammals, the most successful taxonomic class of organisms to colonize the Earth. The word mammal derives from the... Read More
Prototherian mammal
Definition noun, plural: prototherian mammals Any from the group of mammals in which the young develop within the egg that... Read More
Metatherian mammal
Definition noun, plural: metatherian mammals Any from the group of mammals possessing choriovitelline type of placenta (as... Read More
Placental mammal
Definition noun, plural: placental mammals Another term for eutherian mammal, i.e. a mammal possessing a chorioallantoic... Read More
Eutherian mammal
Definition noun, plural: eutherian mammals Any from the group of mammals possessing chorioallantoic placenta (as opposed... Read More
Early Mammals on Earth
By the time the dinosaurs were extinct 65 million years ago, the world's landmass had split up into more or less the... Read More
Monotremata
Definition noun (taxonomy) A subdivision of the class Mammalia comprised of mammals laying eggs rather than giving birth to... Read More
Placentalia
Definition noun (taxonomy) A subdivision of the class Mammalia characterized primarily by their fetus being carried in the... Read More
Fasciola hepatica
Definition noun A liver fluke belonging to the family Fasciolidae of the class Trematoda, and is endemic in the U.S.,... Read More
Argipressin
Definition noun, plural: argipressins A vasopressin that has an amino acid sequence:... Read More
Y-linked gene
Definition noun, plural: Y-linked genes A gene located on the Y chromosome Supplement Y chromosome is the male chromosome of... Read More
Y chromosome
Definition noun, plural: Y chromosomes The male-determining sex chromosome particularly in humans and other... Read More
Parasitism
Organisms depend on different sources of food to survive. Larger organisms like plants make their own food (autotrophs) and... Read More
Melanophore
Definition noun, plural: melanophores A type of pigment cell that, in particular, produce and store... Read More
Sex-determining Region Y gene
Definition noun The gene that codes for the SRY protein, which is associated with the testicular development in many male... Read More
Paraphyletic
Definition adjective A biological taxonomy that pertains to a certain group of organisms does include some but not all of... Read More
Semilunar valve
The human heart structure consists of heart chambers (2 atria and 2 ventricles) that differ functionally from each other.... Read More
Adaptive zone
Definition noun, plural: adaptive zones An ecological opportunity for the development of adaptive radiation, enabling a... Read More
Homo sapiens sapiens
Homo sapiens What are homo sapiens? Homo sapiens is the species of all the highly developed primates on earth, a category... Read More
Memory T cell
Definition noun, plural: memory T cells A long-lived T cell that bears receptors for an antigen during its encounter with a... Read More
Cytotoxic T cell
Definition noun, plural: cytotoxic T cells A T cell responsible for inducing death to target cells (e.g. infected somatic... Read More
T-helper cell
Definition noun, plural: T-helper cells A type of T lymphocyte that assists by activating antigen-presenting leukocytes,... Read More
Extracellular digestion
Definition noun A form of digestion wherein the breaking down of materials into smaller, absorbable components takes place... Read More
Enterococcus faecalis
Definition Non-motile, gram-positive, facultatively anaerobic, microbial species that normally dwells in the... Read More