Q: In a lab investigation, a student notes that two metal blocks have the same mass. Based on this observation, if the two blocks were put on opposite sides of a balance, they would best represent
A: balanced forces.
Q: Gold atoms can be identified based on the number of which subatomic particles?
A: protons
Q: In the human kidney, urea from the blood is filtered through the glomerular membrane into a nephron. The movement of urea across this membrane occurs without an input of energy. Which factor is the most likely reason urea absorption does not require energy?
A: a concentration gradient
Q: Which of these best defines the term "pollutant"?
A:
any substance that is harmful to the environment