2Characteristics of the Animal Kingdom 1) Multicellular2) Heterotrophic3) Sexual Reproduction and Development(Most reproduce sexually)4) Movement – Most animals move around their environment5) No cell walls6) Eukaryotic
3Multicellular Organization Bodies of all animals are multicellular (More than one cell)Each cell depends on the presence and functioning of other cellsThere is a division of labor among cells
4SpecializationDefinition: the evolutionary adaptation of a cell for a particular functionEach cell has its own function, but together they make an organism workExamples: Muscle Cell, Skin Cell, Heart Cell
5Animal OrganizationTissue- a group of cells that perform a common function Example: Muscle TissueOrgans- Body structures that are composed of more than one type of tissue and are specialized for a certain functionExample: HeartOrgan Systems- Many different organs that function together to complete the same task
6Multicellular Organization Multicellularity and Specialization have enabled organisms to evolve and adapt to many environmentsWhy do you think it is more difficult for unicellular organism to adapt to many environments?
7HeterotrophyAll animals are Heterotrophs - they must obtain complex organic molecules from other sourcesIngestion-an animal takes in organic food, usually in the form of other living thingsDigestion-Organic molecules are extracted from the material or cells the animal has taken in.
8Sexual 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 DifferentiationDifferentiation- Cells become specialized
9Movement Most animals move around their environment Movement can only occur because of the relationship between the nervous tissue and the muscle tissueNervous System- allows you to detect stimuli in its environment and within its own bodyMuscular System – Can contract and exert force to move specific parts of the animals body