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What is an animal (Structure of Animals (An organ is a group of several…

- - - - Food gives animals raw materials for growth and with energy for their bodies' activities, such as breathing and moving.
        
        Some animals get oxygen from air and some get it from water.
  - - - Animal movement is usually related to meeting the basic needs of survival and reproduction.
  - - - Some animals produce asexually as well as sexually which is the process when a single organism splits into two identical organisms.
- - - - Biologists hypothesize that all animals came from single celled organisms, but cannot be sure. Animals are classified according to how they are determined by an animal's body structure, the way the animal develops, and its DNA.
        
        All vertebrates are classified in one phylum.
        
        About 97% of animals are invertebrates.