(Q).
Q: What organs are the main organs of the urinary system? Choices: - spleen - prostate - gall bladder - kidneys A:
(A).
kidneys

(Q).
Q: Fermat's principle states that what will always take the path that takes the least amount of time? Choices: - sound - wind - electricity - light A:
(A).
light

(Q).
Q: What's the most common disorder from having an extra chromosome? Choices: - Williams syndrome - Turner syndrome - cri-du-chat syndrome - down syndrome A:
(A).
down syndrome