Q: What are the main organs of the respiratory system? Choices: - ovaries - intestines - kidneys - lungs A:
lungs

Q: Consumers are organisms that depend on other organisms for what? Choices: - knowledge - reproduction - shelter - food A:
food

Q: Q: What are broad explanations that are widely accepted as true? Choices: - scientific experiments - informal theories - scientific hypotheses - scientific theories A:
A: scientific theories

Question: Q: Bread has little holes in it from carbon dioxide produced by what? Choices: - sugar - water - bacteria - yeast A:
Answer: yeast

*Question*
Q: What is released when catabolic pathways break down complex molecules? Choices: - hydrogen - oxygen - food - energy A:
**Answer**
energy

*Question*
Q: What kind of parasites are nearly all ticks that live on the body surfaces of reptiles or mammals? Choices: - helminths - protozoa - ectoparasites - bloodsucking A:
**Answer**
bloodsucking