2. Four Needs of Living Things 1. Four needs of living things. 1. water 2. air 3. place to live 4. food

3. 2. Producers Consumers Decomposers Two new words: autotrophs and heterotrophs Auto = self Troph = feeder Hetero = other Troph = feeder 1. Producers are autotrophs because they make their own food. 2. Consumers are heterotrophs because they eat other organisms. 3. Decomposers break down the remains of organisms. Examples are fungi and bacteria.

4. 3. Six elements form the compounds of life. 1. carbon 2. hydrogen 3. nitrogen 4. oxygen 5. phosphorus 6. sulfur

6. Isotopes One of two or more atoms that have the same atomic number (the same number of protons) but a different number of neutrons. Carbon 12, the most common form of carbon, has six protons and six neutrons, whereas carbon 14 has six protons and eight neutrons. Isotopes of a given element typically behave alike chemically

7. 4. Compounds of life 1. proteins 2. carbohydrates 3. lipids 4. ATP 5. Nucleic acids

8. 5. Compounds of Life Chart 1. Proteins Build and repair body structures and regulate processes in the body. Examples: enzymes and hemoglobin 2. CarbohydratesProvide energy and store energy. Simple and complex carbohydrates 3.LipidsStore energy. Fats and oils are examples. Phospholipids form cell membranes. 4.ATPEnergy carrying molecules. Supplies energy to cells. 5. Nucleic acidsBlueprints of life – make proteins. Example: DNA

9. 6. Carbon, hydrogen, nitrogen, Oxygen, phosphorus, and Sulfur combine to form: Proteins Carbohydrates Lipids ATP Nucleic Acids

10. 5. Carbon, hydrogen, nitrogen, Oxygen, phosphorus, and Sulfur combine to form: Proteins Carbohydrates Lipids ATP Nucleic Acids Hemoglobin Enzymes Simple and Complex carbs Fats, oils Phospholipids Form cell membranes Supplies Energy to cells DNA