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Ch24-1 Introduction to animals - Coggle Diagram
Ch24-1 Introduction to animals
General animal features
Animal are multicellular eukaryotic heterotrophs that have evolved to live in many different habitats
Animal have membrane bound organelles
Animals do not have cell walls
The cells of all animals except sponges are organized into structural and functional units called tissues
Feeding and digestion
Animals are heterotrophic, so they must feed on other organisms to obtain nutrients.
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.
Habitats
Vertebrates and invertebrates live in oceans, in freshwater, and on land. They can be found in deserts grasslands , rain forest , polar regions , and all other land biomes and aquatic ecosystems
Animal cell structure
No matter where an animal lives or what adaptations it has, its cells do not have cell walls.
The cells of all animals, except sponges, are organized into structural and functional units called tissues.
Movement
The evolution of nerve and muscle tissues enables animals to move in ways that are more complex and faster than organisms in other kingdoms.
Some animals are stationary as adults, yet most have a body form that can move during some stage of development.
Support
Just as animals digest their food in different ways, they support their bodies in different ways.
An endoskeleton protects internal organs, provides support for the body, and can provide an internal brace for muscles to pull against.
Reproduction
Most animals reproduce sexually.
Male animals produce sperm.
Female animals produce eggs.
Animals, such as earthworms, that produce both eggs and sperm are called hermaphrodites