Q: What shape is the orbit of a planet? Choices: - cleaved - vertical - spiral - elliptical A:
elliptical

Q: What protects you from pathogens and keeps you healthy? Choices: - immunity system - health system - potent system - immune system A:
immune system

Q: In an experiment, what is the affected variable called? Choices: - form variable - independent variable - control variable - dependent variable A:
dependent variable

Q: In which organs does gas exchange take place between blood and air? Choices: - liver and spleen - kidneys - esophagus and larynx - lungs A:
lungs