Transportation of Food and Other Substances in Animals! In very simple animals, materials are transported through diffusion. In complex animals, there is a special transport system to carry oxygen, carbon dioxide, nutrients, waste products, food and various other substances from one part of the body to the other. This transport system, also called the circulatory system, comprises a blood vascular [...]
Some of the main kinds of Immunity in Animals are as follows: Animal body is always exposed to various harmful invaders such as bacteria, viruses, fungi, toxins as well as parasites. Body has an inherent ability to resist all these invaders and toxins. This ability of the organisms to protect themselves against toxins etc. constitutes immunity. Immunology comprises all the [...]
This article provides information about the important phases in the development of animals: Gametogenesis, Fertilization, Cleavage or segmentation, Gastrulation, Organogenesis, Growth and Differentiation! The development of all organisms is a slow and continuous process in which changes from simple condition lead to more complicated and organized embryo. In general, development of animals includes the following phases. Gametogenesis: The prerequisite for [...]
