Living things and nonliving things are both made up of atoms. Living things have several distinguishing characteristics: they are composed of cells, obtain and use energy, and reproduce. Living things respond to their environment, grow and develop through cell processes, and maintain homeostasis.

1. What are living and nonliving made of? Like living things, nonliving things have properties that you can see, such as color, hardness, or softness. Living things and nonliving things are made of small particles called atoms . Atom made up everything that takes up space.

2. Living Things VS. Non-living Things Biology : is the study of life. Most things in the world are divided into living and nonliving things. e.g. of living things: trees, grass, animals ex. of nonliving things: air, cloud etc.

3. Characteristics of Living Things All living things are made of cells. *** Cells are the basic unit of life. Unicellular organisms are composed of one cell. Prokaryotes are the simplest form of life. No nucleus and organelles ex. Bacteria. Multicellular organisms are composed of many cells. Eukaryotes are the most complex form of life. They have nucleus and organelles. ex. animals and plants.

4. Living Things obtain and use energy Autotrophs : organisms that can make their own food. ex. plants Photosynthesis is process through which plants obtain their energy. Heterotrophs: are organisms that can not make their own food. ex. animals Herbivore :Plant eater Carnivore : flesh eater

5. Living things reproduce Sexual reproduction: involved cell from two different parents (egg and sperm). It is the only way that gene (DNA) is passed on from parents to offspring. Asexual reproduction: a process by a which a single parent reproduces by itself. It involved one parent.

6. Living things respond to their environment. Living things grow and develop as a result of cell division and cell enlargement. Living things maintain a stable internal balance = Homeostasis .

7. Self Check 1. Into what two groups are most things in the world divided? 2. Give three examples of nonliving things? 3. Give three examples of living things? 4. List some properties of living things? 5. What is an organism?