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...
Meiosis is a form of cell division that creates gametes. It is comprised of two divisions that in the end, the resulting..
Dinosaurs represented a major turn in the evolutionary development of organisms on Earth. The first dinosaurs were presu..
DNA is a double helix structure comprised of nucleotides. A nucleotide, in turn, is made up of phosphate molecule, deoxy..
A balanced diet is essential to a healthy organism. Insufficiency or too much of a particular element or compound, such ..
Hormones are produced in the endocrine glands of animals. The pituitary gland and hypothalamus are the most impor..
Plantlife can be studied at a variety of levels, from the molecular, genetic and biochemical level through organelles, c..
