What is animal ?how would you characterized this word..and more
Animals are multicellular , eukaryotic organisms in the biological kingdom Animalia . With few exceptions, animals consume organic material , breathe oxygen , are able to move , can reproduce sexually , and grow from a hollow sphere of cells, the blastula , during embryonic development . Over 1.5 million living animal species have been described —of which around 1 million are insects —but it has been estimated there are over 7 million animal species in total. Animals range in length from 8.5 micrometres (0.00033 in) to 33.6 metres (110 ft). They have complex interactions with each other and their environments, forming intricate food webs . The scientific study of animals is known as zoology . Most living animal species are in Bilateria , a clade whose members have a bilaterally symmetric body plan . The Bilateria include the protostomes , containing animals such as nematodes , arthropods , flatworms , annelids and molluscs , an