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Chapter 25-27

Chapter 25-27 . By: Stacy Mckinney Andrew Strawther Mikayla Brown Jared Rudd . Chapter 25 Animals. Animals are eukaryotic, multicellular, heterotrophic organisms. The first animals evolved in water. Digestion for animals takes place in a internal cavity.

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Chapter 25-27

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  1. Chapter 25-27 By: Stacy Mckinney Andrew Strawther Mikayla Brown Jared Rudd

  2. Chapter 25 Animals • Animals are eukaryotic, multicellular, heterotrophic organisms. • The first animals evolved in water. • Digestion for animals takes place in a internal cavity. • Animals have special cells that help it seek out food and mates, it also allows them to protect themselves from predators.

  3. Chapter 25 Animals • The process of a baby forming inside a animal is the same inside of a human.

  4. Chapter 26 Section 1&2 • Sponges are very simple animals that live permanently attached to a location in the water , they are sessile as adults. • Most sponges are hermaphrodites (an be male or female) fertilization is external sponges release sperm that floats till it finds another sponge. Sponges can break off and attach to rocks and grow as a clone of the first sponge.

  5. Chapter 26 Section 2 • Cnidarians are a diverse group of aquatic animals, more than 9000 species are part of the phylum cnidarian, and all species are aquatic , cnidarians are widespread in marine habitats and less common in fresh water. • Cnidarians come in two forms polyp, medusa. • Polyps- stationary sponges for life • Medusa-freemoving , true jelly fish are meduas.

  6. Classes of cnidarians • Anthozoa • Scxphoza • Hydrozoa • cubozoa

  7. Unsegmented Worms • CHAPTER 26, section 3 and 4

  8. FLATWORMS Belongs to the phylum (plat=flat) 3 classes: -turbellaria -trematoda -cestoda

  9. CHARACTERISTICS • Acoelomates – (no body cavities) • They have bilateral symmetry • Respiration through skin

  10. Class Turbellaria • spade shaped head and 2 eyespots • Scavengers • Flame cells remove waste • Hermaphrodites (have male and female parts) • Reproduce by regeneration

  11. Class Trematoda • Parasitic flukes • Have suckers on both ends of the body • Can live inside or outside of host • Hermaphrodites • Have complex life cycles

  12. LIFE CYCLES • Egg • Miracidium(free living in water) • Sporocyst (in snail) • Redia (in snail) • Cercaria (free living in water/snail) • Metacercaria (in second intermediate host) • adult

  13. Class Cestoda • Parasitic • Tapeworms • Long bodies • Absorbs nutrients from host • hermaphrodites

  14. ROUNDWORMS

  15. Roundworms • belong to phylum Nematoda • Slender bodies that taper on both ends • Have mouth and anus • Can be free living or parasitic

  16. Pinworms live in human intestines • Trichinosis is a disease from eating infected pork

  17. Rotifers • known as wheel animals • Free swimming, transparent • Freshwater and marine • Have a ring of cilia around mouth that brings in food • Feed on unicellular algae and bacteria • Have a muscular organ that chops food

  18. Chapter 27 • What is a mollusk? -slugs, snails, squids, and some animals that live in shells in the ocean or on the beach • Mollusks have bilateral symmetry, a coelom, a digestive tract with two openings, a muscular foot, and a mantle

  19. Chapter 27 • Mollusks use a rasping structure called radula to obtain food -radula can be used to drill, scrape, grate, or cut out food • They reproduce sexually

  20. Chapter 27 • Have simple nervous systems that control their movement and behavior • Have well-developed circulatory system that usually includes a two or three-chambered heart

  21. Chapter 27 • Most mollusks have an open circulatory system; the blood moves through vessels and into open spaces around the body organs • Some move nutrients and oxygen through a closed circulatory system; blood moves through the body enclosed entirely in a series of blood vessels • Most have respiratory structures called gills

  22. Chapter 27 • Three classes -Gastropoda; one-shelled -Bivalvia; two-shelled -Cephalopoda; head-footed

  23. Chapter 27 • What is a segmented worm? -leeches, bristleworms, earth worms • Bilaterally symmetrical and have coelom and two body openings

  24. Chapter 27 • Food is taken in by the mouth • Have simple nervous systems, organs have become modified for sensing the environment • Have closed circulatory systems

  25. Chapter 27 • Earthworms and leeches are hermaphnodites • Bristleworms reproduce sexually

  26. Chapter 27 • Three classes -Oligochaeta; earthworms -Polychaeta; brislteworms -Hirudinea; leeches

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