D- Park Clean-ups is the correct answer to this question.
I don't think the answer is A as that seems a bit drastic, I think it's C.
<span>To provide a great deal of information at a glance</span>
The phase contrast microscope uses out-of-phase and in-phase light rays that produce contrast areas allowing scientists to detect even a minute number of protein molecules and focus on the minute internal structures of a particle.
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Answer:
1. Air warms, becomes less dense, it rises
2. Air cools down, increases density (becomes denser), it sinks