Animal Notes Chapter 25 Notes

Characteristics of Animals Multicellular eukaryotes Multicellular eukaryotes Ability to move to reproduce, obtain food, protection Ability to move to reproduce, obtain food, protection Do NOT have cell walls Do NOT have cell walls Heterotrophs: consume other organisms for energy Heterotrophs: consume other organisms for energy

Characteristics of Animals Digestion of food and storage for energy later (ATP) Tissues, organs, organ systems (nerves and muscles unique to animals) Most reproduce sexually

Invertebrates: Animals that lack backbones Animals that lack backbones 95% of the animal kingdom 95% of the animal kingdom Exoskeletons are common, can have endoskeleton Exoskeletons are common, can have endoskeleton Examples: sponges, worms, mollusks, arthropods (insects, crabs), jellyfish Examples: sponges, worms, mollusks, arthropods (insects, crabs), jellyfish

Vertebrates: Animals that have backbones Animals that have backbones All have bilateral symmetry (can be divided into two identical halves) All have bilateral symmetry (can be divided into two identical halves)

Examples of Vertebrates: Fish: Fish: Aquatic, have gills Aquatic, have gills 2-chambered heart 2-chambered heart Usually lay eggs Usually lay eggs

Class Chondrichthyes: Cartilaginous fish

Jawless Fish:

Examples of Vertebrates: Amphibians: Live in water and on land Moist skin Eggs lack shells so must be laid in moist areas Breathe with lungs or skin Ex: frogs, toads, salamanders Class Amphibia

Examples of Vertebrates: Reptiles: Reptiles: Scaly skin Scaly skin Amniotic egg Amniotic egg Ex: snakes, turtles, crocodiles Ex: snakes, turtles, crocodiles Class Reptilia

Examples of Vertebrates: Birds: Birds: Feathers Feathers Hollow bones Hollow bones Wings for flight Wings for flight Ex: flamingo, owl, eagle, robin Ex: flamingo, owl, eagle, robin Class Aves:

Examples of Vertebrates: Mammals: Hair or fur Milk Complex behavior Bear live young instead of eggs (exception: marsupials & platypus) Placental mammals: baby develops in uterus Ex: humans, dog, horse, whale, elephant, bat