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What is an animal? (Pg. 6-11) (Function of Animals (Reproduction (Some…
What is an animal? (Pg. 6-11)
Structure of Animals
Animals are composed of many cells
Cells of most animals are organized into higher levels of structure, including:
Organs
A group of several different tissues
Systems
All the bones form the skeletal
Tissues
A group of similar cells that preform a specific function
Nerve tissue
carries messages in the form of electrical signals
Bone Tissue
hard tissue that gives bones strength
Function of Animals
obtainting Food and Oxygen
Animals obtains food by eating other organisms
Food provides animals with raw materials for growth and energy
Keeping Conditions Stable
Animals must maintain a stable environment within their bodies
Animal haves adaptions, to keep there bodies OK
Movement
All animals move in some way at some point in their lives
They all move in different ways
They move to meet the needs of life
Reproduction
Most animals sexually
The joining of an egg cell and a sperm cells is called fertilization
Some animals produce Asexual
A organism produces itself
Classification of Animals
There are 1.5 million species of animals
Biologists have classified about 35 animal groups
Each is called a phylum
Animals are classified according to how they are related to other animals
determined by:
Body Structure
Way it developed
DNA