IV. The Diversity of Cellular Life A. Unicellular Organisms --Single-celled Organisms that do all a living thing would ----They dominate life on earth in terms of numbers

B. Multicellular organisms Made up of many cells Depend on communication and cooperation between specialized cells ---_______________-cells throughout organism can develop in different ways to perform different tasks Cell specialization

1. Specialized animal cells eg. Red blood cells equipped to carry oxygen ;cells specialized to produce proteins produced in pancreas(have many ribosomes and rough ER);muscle cells have actin and myosin cytoskeleton elements for contraction 2. Specialized Plant cells ______________________-are tiny openings on underside of leaves and exchange gases _____________________-regulate gaseous exchanges in stomata,changing shape due to plant’s internal conditions   stomata Guard cells

C. Levels of Organization 1. individual cells 2. _____________________-group of similar cells w/ particular function 3. ______________-group of tissues working together 4. ______________-group of organs working together for particular function   tissue organ Organ system