Q: Which two gases make up the bulk of earth's atmosphere? Choices: - carbon and oxygen - phosphorus and oxygen - nitrogen and argon - nitrogen and oxygen A:
nitrogen and oxygen

Q: Which organ will bladder infections commonly damage if untreated? Choices: - lungs - heart - tissue - kidney A:
kidney

Q: Q: In the cardiovascular system, what blood vessels carry blood away from the heart? Choices: - veins - capillaries - cilia - arteries A:
A: arteries

Question: Q: The ambrosia beetle bores holes in? Choices: - flowers - dirt - leaves - tree bark A:
Answer: tree bark

*Question*
Q: The ability to what is affected by the velocity, or speed, of the water? Choices: - construct - impede - hinder - erode A:
**Answer**
erode

(Q).
Q: How many types of simple machines are there? Choices: - ten types - three types - two types - six types A:
(A).
six types