Animal Symmetry: Transitioning from Vertebrates to Invertebrates! 5 th Grade.
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Transcript of Animal Symmetry: Transitioning from Vertebrates to Invertebrates! 5 th Grade.
What are Invertebrates?
• Animals without backbones
• What percent of animals are Invertebrates?
• 97 percent of all animals are invertebrates!
Animal Symmetry
Symmetry: the balanced arrangement of partsAnimal Symmetry: the balanced arrangement of parts, characteristic of many animals
Bilateral Symmetry
• there is one line of symmetry that divides an an animal into halves that are mirror images
Radial Symmetry
*Animals with radial symmetry have many lines of symmetry that all go through a central point
Animals with Radial Symmetry
• The external body parts of animals with radial symmetry are equally spaced around a central point
• Ex. sea stars, jelly fish, sea urchins
Characteristics of animals with Radial Symmetry
• All live in water
• Most do NOT move very fast
• They tend to stay in one spot, are moved along by water currents, or creep along the bottom of the ocean
Characteristics of animals with Bilateral symmetry
*Are larger and the most complex
*They have a front end that typically goes first as the animal moves along
*Can move quickly and more efficiently than animals with radial symmetry because bilateral symmetry allows for a streamlined body
Characteristics of animals with Bilateral symmetry
*most animals with bilateral symmetry have sense organs in their front ends that pick up information about what is in front of them
Ex. a tiger has eyes, ears, nose, and whiskers on its head
*sense organs help animals with bilateral symmetry obtain food and avoid enemies
1) What is symmetry? 2) How are bilateral symmetry and radial
symmetry alike? How are they different? 3) What kind of symmetry does a grasshopper
have? 4) What general characteristics do animals with
radial symmetry share? 5) What four body characteristics do animals
with bilateral symmetry usually have? 6) How would having sense organs in front be
helpful to an animal?