Q: What does the tires meeting the road cause when a car accelerates? Choices: - erosion - vibration - thrust - friction A:
friction

Q: When two of these meet, the result is often a storm? Choices: - air pockets - electromagnetic waves - tectonic plates - air masses A:
air masses

Q: Q: All new alleles are formed by what types of mutations? Choices: - chaotic - systemic - ordinary - random A:
A: random

Question: Q: What do all respiratory diseases affect? Choices: - liquid exchange process - helium exchange process - transit exchange process - gas exchange process A:
Answer: gas exchange process

*Question*
Q: What does a hypothesis become after many experiments provide results supporting it? Choices: - a model - a fact - a study - a theory A:
**Answer**
a theory

(Question)
Q: What do we call forces that act on the system from outside? Choices: - material - internal - static - external A:
(Answer)
external