Q: What is the smallest unit of structure and function of all living organisms? Choices: - chromosome - organelle - organ - the cell A:
the cell

Q: Chemical symbols are useful to concisely represent the elements present in a substance. the letters usually come from the name of what? Choices: - month - scientist - discoverer - element A:
element

Q: Q: What is the most common cause of lung cancer? Choices: - coal smoke exposure - restaurant smoke exposure - tree smoke exposure - tobacco smoke exposure A:
A: tobacco smoke exposure

Question: Q: Continuous-flow reactors are chemical reaction vessels in which the what are mixed and allowed to react as they flow along a tube? Choices: - reactives - generators - propellants - reactants A:
Answer: reactants

*Question*
Q: What is the most abundant element in the universe? Choices: - carbon - helium - nitrogen - hydrogen A:
**Answer**
hydrogen

(Question)
Q: A comet striking the earth may have caused mass extinction, this would have decreased sunlight, which would have effected what plant process reducing food? Choices: - fertilization - decomposition - glycolysis - photosynthesis A:
(Answer)
photosynthesis