2. Features of Life

3. Defined: the study of life Organism: anything that can carry on the processes of life Species: organisms that can create fertile offspring –Over 2 million known species –More diverse along equator Oldest life (bacteria) = 3.5 billion years old Biology

4. Is this biology?

11. 1)Made of cells 2) Reproduces 3) Grows and Develops 4) Has organization 5) Requires energy 6) Responds to environment

12. 1)Made of cells 2) Reproduces 3) Grows and Develops 4) Has organization 5) Requires energy 6) Responds to environment

13. All life has a few common characteristics 1) Made from cells –Cell = most basic unit of life capable of carrying on life processes –Cells are specialized for specific duties Ex: Red blood cells carry O 2 Life Characteristics

14. 2) Requires energy –Energy = ability to do work or cause change –Energy controls metabolism (ability to break down materials) –Energy obtained from the sun Autotrophs: create sugars directly from the sun –Photosynthetic organisms (plants & algae) Heterotrophs: consumes others for energy –Can’t performs photosynthesis (ex: fungi & animals) Life Characteristics

15. 3) Responds to environment –Stimulus = environmental factors –Stimulus examples: Sound, light, touch Life Characteristics !*%!?%&#

16. 4) Reproduces and develops –Genetic material (DNA) passed to next generation Types of Reproduction a) Asexual reproduction: Genetically identical offspring produced from a single parent Ex: bacteria, protista, some plants & animals b) Sexual reproduction: Offspring is a genetic mixture of two parents Ex: Most fungi, plants, animals Life Characteristics

17. REview 1)Name 4 features common to all life? 2)Which type of reproduction creates identical offspring? 3)In general, which group of life performs photosynthesis to make their own food? 4)What is the ability to break down food called? 5)A loud noise or a sharp pain is an example of a _____. 6)Which type of reproduction creates genetic diversity?