(Q).
Q: What is the theory scientists use to explain the matter in the universe and how it's held together? Choices: - specific model - original model - organic model - standard model A:
(A).
standard model

(Q).
Q: Is sleep an active or inactive state in the brain? Choices: - intense - different - inactive - active A:
(A).
active

(Q).
Q: How many types of surface waves are there? Choices: - over a hundred - three - six - two A:
(A).
two