Definition noun A medical term used to refer to a condition or state in which a woman has never given birth to a child, or has never carried a pregnancy. Supplement Word origin: from Latin nūllus, none + parere, to give birth. Related forms: nulliparous (adjective). Compare: multiparity...
The nucleus containing the genetic material, DNA, and the mitochondria, well-identified as the "powerhouse of the cell",..
New Zealand is known for its unique biodiversity, caused by its remarkable geography and geologic history. Breaking away..
The gastrointestinal system breaks down particles of ingested food into molecular forms by enzymes through digestion and..
Planktons are microscopic organisms that live suspended in aquatic habitats. There are two groups: the phytoplanktons an..
Dinosaurs represented a major turn in the evolutionary development of organisms on Earth. The first dinosaurs were presu..
In plants, growth occurs in meristems, which are the site of repeated cell division of unspecialized cells. These cells ..
