Animal characteristics
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invertebrates—animals without backbones.
vertebrate- animals with backbones
Hermaphrodites animals: Produce both sperms and eggs in the same body.
Fertilization: Occurs when the sperm penetrates the egg to form a fertilized egg called the zygote
The bodies of many invertebrates are covered with exoskeletons
Habitats
Some invertebrates have internal skeletons called endoskeletons
Live in:
Ocean - Freshwater - Land - Dessert - Forests - polar regions - Grasslands - Rain Forests - Aquatic
Ecosystems
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External fertilization: Occurs when the perm and egg meet outside the animal's body.
Internal fertilization: Occurs when sperm and egg meet inside the animla's body
feeding and digestion:Animals are heterotrophic, so they must feed on other organisms to obtain nutrients.
After obtaining their food, animals must digest it.
Some animals, such as sponges, digest their food inside specific cells. Others, such as earthworms and humans, digest their food in internal body cavities or organs.
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Vertebrates: Animals that have back bones Invertebrates: Animals that don't have back bones
Exoskeletons also protect soft body tissues, pre- vent water loss, and provide protection from predators.
Movement
Stationary: Animals that lack movement
Have the ability to move during some development stages
Such as: Walking - running - flying
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An endoskeleton protects internal organs, provides support for the body, and can provide an internal brace for muscles to pull against.