Look up Evelyn in Wiktionary, the free dictionary. Evelyn is a name in the English language, where it can be used as a first name or a surname. As a first name, it can refer to persons of either sex, although it is more commonly borne by females.The name originally was used a surname, which derived from Aveline, a feminine Norman French diminutive of the name Ava.ook up Evelyn in Wiktionary, the free dictionary. Evelyn is a name in the English language, where it can be used as a first name or a surname. As a first name, it can refer to persons of either sex, although it is more commonly borne by females.
Cephalization Cephalization is the process in animals by which nervous and ... Although cephalization is associated primarily with bilaterally symmetrical ... While at first seeming a bit simplistic, cephalization has ... Cephalization means that there is a head, and therefore a concentration of ...ephalization: Evolutionary Process where nerves and sensory structures evolved in the head. ... ... bilateral symmetry with obvious cephalization, three embryonic germ layers with ... is the first step toward cephalization and development of a central ...
The first steps leading up to fertilization - the fated meeting of egg and sperm. Next stop: fertilization and oocyte activation. Fertilization is the fusion of two haploid gametes to produce a diploid zygote. Each haploid gamete in humans has 23 chromosomes, while the diploid zygote has 46. This fusion usually occurs within 24 hours after the oocyte has been released from the ovary.