CONTENTS:- 1. Introduction. 2. Metabolism. 3. Types of animal digestive systems. 4. Human influences on the nitrogen cycle. 5. Animal polysaccharides. 6. Bioenergetics and biosynthesis.
Animals are a large and incredibly diverse group of organisms. Making up about three quarters of the species on earth, they run the gamut from corals and jellyfish to ants, whales, elephants, and of course humans. Being mobile has given animals, which are capable of sensing and responding to their environment, the flexibility to adopt many different modes of feeding, defence and reproduction. Unlike plants, however, animals are unable to manufacture their own food and therefore, are always directly or indirectly dependent on plant life. Most animal cells are diploid, meaning that their chromosomes exist in homologous pairs. Different chromosomal policies are also, however, known to occasionally occur. The proliferation of animal cells occurs in a variety of ways. In instances of sexual reproduction, the cellular process of meiosis is first necessary so that haploid daughter cells or gametes, can be produced. Two haploid cells then fuse to form a diploid zygote, which develops into a new organism as its cells divide and multiply. This book, which we hope will lay the foundations for the next generation of this subject.