ANIMAL UNIT PART 2

6 MAJOR GROUPS

• Worms and Ecinoderms
• Cnidarians and Arthropods
• Mollusks and Sponges

MOLLUSKS

• Reproduce sexually, eggs are released before fertilization
• hard shells, head, false foot, mantel
• oysters and clams, snails are most common
• Move slowly, patterns on shells, easy to catch

ARTHROPODS

• Some reproduce sexually and or asexually laying eggs
• swimming, waddling
• Lobsters, crabs, shrimp, butterfly, insects
• Blend in with surroundings, hard shells, move fast
• Jointed appendages

WORMS

• Reproduce sexually and asexually
• one and two way digestive system
• Slow moving, hook together to mate
• Live in dirt, and colonies
• Segmented, flat, and round worms

CNIDARIANS

• Sting for protection
• Reproduce sexually- polyp off mother then freely swim
• Digestion sack, eat out of the mouth and release waste out of mouth
• Three layers of protection, carry internal organs and important body parts

ECINODERMS

• Adults are known for racial symmetry
• Sea stars, sea cucumbers, sea urchins
• Regenerate tissue, limbs, and vital organs
• Mate sexually, reach maturity at 2-3 years old
• Sea star has asexual reproduction

SPONGES

• Reproduce sexually
• 2 outer layers of protection
• Sea sponges, brain coral
• Different shapes and colors
• Live in different parts of the ocean