2 Characteristics 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
3 Multicellular 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
4 SpecializationDefinition: 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
5 Animal 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
6 Multicellular 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?
7 HeterotrophyAll 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.
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 DifferentiationDifferentiation- 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 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