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What are Animals
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What are Animals?
Characteristics of Animals
Characteristsics
Cells
Animals Cells
Animal cells do not have a cell wall
They do have a nucleus
Animals are the only living things with nerve cells
Animals are all multicellular
Energy
How Animals get Energy
Animals are heterotrophic
They must get energy from eating
Animals DO NOT do photosynthesis
Reproduction
Animal Reproduction
Most animals do sexual reproduction
All animals begin as a fertilized egg cell called a zygote
The zygote divides into more cells and forms an embryo
After many more divisions, the body of the animal forms
How are animals grouped?
How Animals are Grouped
Taxonomy
Taxonomy
All living things are classified into groups.
The largest groups are called domains.
Animals are in the domain Eukaria because their cells have a nucleus
The domain Eukaria is divided into smaller groups called kingdoms
Animals have their own kingdom.
Symmetry
Bilateral
Bilateral Symmetry
Symmetry is how a body is arranged
Bilateral symmetry means that 2 sides are mirror images of each other
Radial
Radial Symmetry
Radial symmetry is when a body can be divided into equal, mirror parts by drawing a line anywhere through the center
Asymmetry
Asymmetry
A symmetry is when there is no symmetry.
If you draw a line on these organisms there will be no mirroring parts
Adaptations
Structural Adaptations
Structural Adaptations
Animals can have body adaptations that help them survive
There are different types of body structures
1. Hydrostatic skeletons are fluid filled soft bodies
2. Exoskeletons are thick, hard outer coverings
3. Endoskeletons are made of bone and are inside the body
Behavioral Adaptations
Behavioral Adaptations
Animals can have behavioral adaptations that help them survive
Behaviors that animals are born with are called instincts
Animals can also learn new behaviors