Q: What is the invisible force that pulls things to earth? Choices: - motion - momentum - electromagnetism - gravity A:
gravity

(Question)
Q: What does burning wood release into the atmosphere? Choices: - oxygen - helium - hydrogen chloride - carbon dioxide A:
(Answer)
carbon dioxide

Ques: Q: What is the study of viruses called? Choices: - immunology - microbiology - biotechnology - virology A:
Ans: virology

(Q).
Q: What is the sum of the massess of the atoms in a molecule? Choices: - underlying mass - magnetic mass - nuclear mass - molecular mass A:
(A).
molecular mass

Ques:Q: What is liquid water falling from the sky called? Choices: - snow - clouds - evaporation - rain A:

Ans:rain

Q: What do you call different organs working together? Choices: - cellular system - endocrine system - maturation systems - organ systems A:
organ systems