Answer the following question given this paragraph: The orbits of the planets are elliptical. Q: What shape is the orbit of a planet? Choices: - cleaved - vertical - spiral - elliptical A:
elliptical

Answer the following question given this paragraph: Your immune system usually protects you from pathogens and keeps you well. However, like any other body system, the immune system itself can develop problems. Sometimes it responds to harmless foreign substances as though they were pathogens. Sometimes it attacks the body's own cells. Certain diseases can also attack and damage the immune system and interfere with its ability to defend the body. Q: What protects you from pathogens and keeps you healthy? Choices: - immunity system - health system - potent system - immune system A:
immune system

Answer the following question given this paragraph: An experiment generally tests how one variable is affected by another. The affected variable is called the dependent variable . In the plant experiment shown above, the dependent variable is plant growth. The variable that affects the dependent variable is called the independent variable . In the plant experiment, the independent variable could be fertilizersome plants will get fertilizer, others will not. The scientists change the amount of the independent variable (the fertilizer) to observe the effects on the dependent variable (plant growth). An experiment needs to be run simultaneously in which no fertilizer is given to the plant. This would be known as a control experiment. In any experiment, other factors that might affect the dependent variable must be controlled. In the plant experiment, what factors do you think should be controlled? ( Hint: What other factors might affect plant growth?). Q: In an experiment, what is the affected variable called? Choices: - form variable - independent variable - control variable - dependent variable A:
dependent variable

Answer the following question given this paragraph: Respiration begins with ventilation . This is the process of moving air in and out of the lungs. The lungs are the organs in which gas exchange takes place between blood and air. Q: In which organs does gas exchange take place between blood and air? Choices: - liver and spleen - kidneys - esophagus and larynx - lungs A:
lungs