Answer to Question #271721 in Zoology for ron

Question

write an essay and explain the significance of i. Development of a coelom ii. Bilateral symmetry and cephalization iii. Segmentation in the evolution of animal kingdom

Answer 1

Development. Coelom is the mesodermally lined cavity between the gut and the outer body wall. During the development of the embryo, coelom formation begins in the gastrulation stage. ... The archenteron wall produces buds of mesoderm, and these mesodermal diverticula hollow to become the coelomic cavities.

Cephalization is defined as the evolutionary trend toward nervous system centralization and the development of a head and brain. Cephalized organisms display bilateral symmetry. Sense organs or tissues are concentrated on or near the head, which is at the front of the animal as it moves forward.

Segmentation in biology is the division of some animal and plant body plans into a series of repetitive segments. This article focuses on the segmentation of animal body plans, specifically using the examples of the taxa Arthropoda, Chordata, and Annelida.