Ques and Ans: What will die without a supply of blood?
Options:
- (A) plants
- (B) organs
- (C) brain cells
- (D) athletes
- (E) humans
- (F) species
- (G) critical organs
- (H) mushrooms
(C)
Explanation for the Ans above: [[Brain cells die quickly if their oxygen supply is cut off. Here, the lungs supply the blood with oxygen. Brain cells die quickly if their blood supply is cut off.]]

Ques and Ans: A response to what occurs when many muscles contract a little at once?
Options:
- (A) heat
- (B) cold
- (C) sweat
- (D) pain
- (E) forces
- (F) stress
- (G) comfort
- (H) motion
(B)
Explanation for the Ans above: [[Shivering occurs when many muscles contract a little bit all at once. Another response to cold is shivering. A response to cold occurs when many muscles contract a little at once.]]

Ques and Ans: What moves with long filaments?
Options:
- (A) prokaryotes
- (B) sponges
- (C) an object
- (D) lizards
- (E) protein
- (F) sensory neurons
- (G) insects
- (H) Most plants
(A)
Explanation for the Ans above:
[[Flagella help prokaryotes move. Flagella are long filaments made up of the protein flagellin. Long filaments help prokaryotes move.]]