Animals 6-3.1 Compare the characteristic structures of invertebrate animals (including sponges, segmented worms, echinoderms, mollusks, and arthropods) and vertebrate animals (fish, amphibians, reptiles, birds and mammals.
Animal Classification 35 animal phyla (groups) Classified into 2 large groups: Vertebrates: backbone Invertebrates: no backbone
Common Characteristics All animals: Multi-cellular bodies Heterotrophs: can’t make their own food – must eat plants/other animals Major Functions: obtain food and oxygen for energy keep internal conditions in balance move reproduce
Vertebrates 5 groups of vertebrates: 1. fish 2. amphibians 3. reptiles 4. birds 5. mammals
Characteristics of Vertebrates Backbone Internal skeleton (endoskeleton) Muscles
Characteristics of Vertebrates Blood that circulates through blood vessels and lungs (or gills) for breathing
Characteristics of Vertebrates Protective skin covering
Characteristics of Vertebrates Legs, wings, or fins for movement
Characteristics of Vertebrates Have a nervous system with a brain that processes information from their environment through sensory organs
Differences between Vertebrates Some vertebrates are cold-blooded: their body temperature is close to that of their environment. *ectothermic Ex: fish, amphibians, reptiles Others are warm-blooded: their body temperature stays constant regardless of the temperature of the environment. *endothermic Ex: birds and mammals
Fish Cold-blooded (ectothermic) Obtain dissolved Oxygen in water through gills Most lay eggs Have scales Have fins Live in water
Amphibians Cold-blooded (ectothermic) Most can breathe in water as young, and breathe on land as adults Go through metamorphosis Lay jelly-like eggs
Amphibians Major groups: frogs, toads, salamanders Frogs and salamanders have smooth, moist skin. This helps them to breathe and live partly in water/partly on land. Toads have thicker, bumpy skin and live on land.
Reptiles Cold-blooded (ectothemic) Breathe with lungs Most lay eggs Sometimes the eggs hatch inside the female Have scales/plates
Birds Warm-blooded (endothermic) Breathe with lungs Lay eggs Have feathers Have a beak, two wings, two feet
Mammals Warm-blooded (endothermic) Breathe with lungs Most have babies that are born live Have hair/fur Produce milk to feed their young