INVERTEBRATE ANIMALS Chapter 6 Section 1 What is

INVERTEBRATE ANIMALS Chapter 6 Section 1

What is an animal? Many-celled organisms that are made of different kinds of cells � Most have nucleus and organelles surrounded by membrane � Cannot make their own food � Digest their own food � Can move from place to place �

� � � Symmetry To study animals, you must look at their symmetry. Symmetry- arrangement of individual parts of an object Most animals have radial or bilateral symmetry �Radial: body parts arranged in circle around central point Bilateral: have parts that are mirror images

Symmetry Some have no definite shape. �Asymmetrical �Bodies can’t be divided into matching halves � Examples: �Radial: jellyfish �Bilateral: lobsters �Asymmetrical: sponges �

Animal Classification Animals divided into two groups: vertebrates invertebrates Vertebrates: have backbone Invertebrates: no backbone

Invertebrates � � � � � Invertebrates divided into two smaller groups: Sponges Cnidarians Flatworms Roundworms Mollusks Annelids Arthropods Echinoderms

Exit Ticket Choose one of the following questions and answer it in a complete sentence on a sheet of paper. � 1. What is the difference between vertebrates and invertebrates? � 2. What are the different types of symmetry? Explain them. �