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what is an animal (classification of animals (animals are classified…

- - - - DNA- a cell that controls an organisms inheritance
  - - - 97% of animals are invertebrates
- - - - the joining of two sex cells.
      - the joining of these cells is called fertilization.
      - the offspring to these animals will have similar traits to there parents
    - - asexual- when an organism creates an organism identical to itself.
- - - - tissues
        
        a group of alike cells that work for the same goal
        
        ex: nerve tissue carries messages in the form one part of the body to another with electrical signals.
      - organs
        
        when there are different tissues working together toward the same goal it is called an organ.
        
        an organ is more complicated then tissues because it has different things to preform.
      - systems
        
        groups of structures working together is called a system