1. A way of learning about the natural world. a. science b. scientific inquiry c. scientific theory d. scientific method

2. A. science

3. ______ are factors that can change in an experiment a. controls b. variables c. data d. concepts

4. b. variables

5. What is the purpose of using a variable in an experiment? A. to serve as the factor that stays the same b. to have the same results as the control c. to be the factor that gets tested d. to develop the hypothesis

6. c. to serve as the one factor that gets tested

7. Recorded observations or measurements are called a. variables b. theories c. data d. scientific method

8. c. data

9. The amount of liquid in a glass would most likely be measured using which of the following units? a. millilitersb. centimeters c. grams d. cubic meters

10. a. milliliters

11. All living things get energy either directly or indirectly from a. animals b. sun c. plants d. water

12. b. sun

13. The building up or breaking down of chemical substances necessary for life is called a. ingestion b. respiration c. excretion d. metabolism

15. Organisms receive signals that causes them to react. What are these signals known as? A. responses b. signals c. movements d. stimulus

17. An independent variable is a. what the scientist changes b. what changes because of what the scientist changed c. another name for hypothesis d. also called the control

18. a. what the scientist changes

19. The mistaken idea that living things come from nonliving sources is known as a. stimuli b. homeostasis c. heterotrophs d. spontaneous generation

21. Organsims use ________to keep conditions like body temperature at a constant rate in spite of the conditons outside a. stimulus b. responses c. homeostasis d. energy

22. c. homeostasis

23. The process of breaking down food so that it can be used by living things is a. ingestion b. digestion c. respiration d. transport

24. b. digestion

25. In order to live all plants and animals need a. darkness b. helium c.food d. nitrogen

26. c. food

27. A well-tested experiment becomes a concept called A. scientific inquiry b. scientific method c. science d. scientific theory

29. Measuring temperature in the Metric System what units would you be using? A. meters b. liters c. grams d. degrees Celsius

31. Organisms that are made of only one cell are called a. unicellular b. multicellular c. autotrophs d. heterotrophs

32. a. unicellular