Unit 2: Cells Chapter 3: Cells, The Basic Units of Life Lesson 3.3: Organization of Life

A single CELL has all the necessary items to carry out life’s activities Every living thing has at least one cell. Every living thing begins as a single cell 200 different kinds of cells in your body Each kind is specialized to do a specific function

TISSUES: Cells working in teams Cells are grouped together to make a tissue that has a function A TISSUE is a group of cells that work together to perform a specific job in the body. See page 77 figure 2

ORGANS: Teams Working Together A group of tissues working together for a specific job is called an ORGAN See page 78 figure 3 (note plants also have organs such as stems and roots)

ORAN SYSTEMS: A great combination Organs work together in groups to perform a particular job. These groups are called ORGAN SYSTEMS See page 78 figure 3 ORGAN SYSTEMS work together to form and ORGANISM (like You!!!)

ORGANISMS: Independent Living Anything that can live on its own is called an ORGANISM All organisms are made up of at least one cell If a single cell is living on its own it is called UNICELLULAR MULTICELLULAR - you can only exist as a group of cells and the cells can only survive as part of your body.

THE BIG PICTURE Organisms interact with each other in many ways. A group of organisms that are of the same kind and that live in the same area make up a POPULATION Two or more different populations living in the same area make up a COMMUNITY

ECOSYSTEM The community and all of the nonliving things that affect it, such as: Water Soil Rocks Temperature Light All Make up an ECOSYSTEM TERRESTRIAL: Ecosystems on land (ex. forests, desert, prairies, your backyard…) AQUATIC: Ecosystems in water (rivers, ponds, lakes, oceans, aquariums…)

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