1. Animals
Chapter 32

2. Characteristics of the Animal Kingdom
1) Multicellular
2) Heterotrophic
3) Sexual Reproduction and Development
(Most reproduce sexually)
4) Movement – Most animals move around their environment
5) No cell walls
6) Eukaryotic

3. Multicellular Organization
Bodies of all animals are multicellular (More than one cell)
Each cell depends on the presence and functioning of other cells
There is a division of labor among cells

4. Specialization
Definition: the evolutionary adaptation of a cell for a particular function
Each cell has its own function, but together they make an organism work
Examples: Muscle Cell, Skin Cell, Heart Cell

5. Animal Organization
Tissue- a group of cells that perform a common function Example: Muscle Tissue
Organs- Body structures that are composed of more than one type of tissue and are specialized for a certain function
Example: Heart
Organ Systems- Many different organs that function together to complete the same task

6. Multicellular Organization
Multicellularity and Specialization have enabled organisms to evolve and adapt to many environments
Why do you think it is more difficult for unicellular organism to adapt to many environments?

7. Heterotrophy
All animals are Heterotrophs - they must obtain complex organic molecules from other sources
Ingestion-an animal takes in organic food, usually in the form of other living things
Digestion-Organic molecules are extracted from the material or cells the animal has taken in.

8. Sexual Reproduction and Development
Most animals reproduce sexually – Two haploid cells (gametes) form a diploid cell (Zygote).
Development – Cells keep dividing by Mitosis and cells undergo Differentiation
Differentiation- Cells become specialized

9. Movement Most animals move around their environment
Movement can only occur because of the relationship between the nervous tissue and the muscle tissue
Nervous System- allows you to detect stimuli in its environment and within its own body
Muscular System – Can contract and exert force to move specific parts of the animals body