sexual cell
91Reproduction — For other uses, see Reproduction (disambiguation). Production of new individuals along a leaf margin of the air plant, Kalanchoe pinnata. T …
92Sexually dimorphic nucleus — (SDN) is a cluster of cells located in the preoptic area of hypothalamus of the brain that is believed to be related to sexual behavior in animals. The volume of SDN is significantly larger (about twice) in males than in females, caused mainly by …
93Parthenogenesis — (from the Greek παρθένος parthenos , virgin , + γένεσις genesis , creation ) is an asexual form of reproduction found in females where growth and development of embryos or seeds occurs without fertilization by a male. The offspring produced by… …
94nervous system, human — ▪ anatomy Introduction system that conducts stimuli from sensory receptors to the brain and spinal cord and that conducts impulses back to other parts of the body. As with other higher vertebrates, the human nervous system has two main… …
95Gender — This article is about the distinction between male and female entities and concepts. For other uses, see Gender (disambiguation). Gender is a range of characteristics used to distinguish between males and females, particularly in the cases of men …
96Plasmodium — This article is about the malaria parasite. For plasmodial slime molds, see Slime mold. Plasmodium Scientific classification Domain: Eukaryota …
97Altern — Die Zeit befiehlt dem Alter, die Schönheit zu zerstören, Ölgemälde von Pompeo Batoni aus dem Jahr 1746 …
98fern — fernless, adj. fernlike, adj. /ferrn/, n. any seedless, nonflowering vascular plant of the class Filicinae, of tropical to temperate regions, characterized by true roots produced from a rhizome, triangular fronds that uncoil upward and have a… …
99Fern — /ferrn/, n. a female given name. * * * Any of about 10,000–12,000 species (division Filicophyta) of nonflowering vascular plants that have true roots, stems, and complex leaves and reproduce by spores. Though ferns were once classified with the… …
100hormone — hormonal, hormonic /hawr mon ik, moh nik/, adj. /hawr mohn/, n. 1. Biochem. any of various internally secreted compounds, as insulin or thyroxine, formed in endocrine glands, that affect the functions of specifically receptive organs or tissues… …
