(Q).
Q: The waste of cows releases a lot of which type of gas? Choices: - carbon dioxide - oxygen - sulphur - methane A:
(A).
methane

(Q).
Q: What is it in bone marrow transplants that may cause a graft versus host reaction? Choices: - tumors - neutrophils - cancer - lymphocytes A:
(A).
lymphocytes

(Q).
Q: What energy, produced by vibrations, cannot travel through empty space? Choices: - light - heat - plasma - sound A:
(A).
sound