Answer:
Hydrogen emits and absorbs light at specific wavelengths, therefore if you're looking at a distant cloud that produces a certain spectrum
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The right answer is A. An impact of changing scientific knowledge on society
Answer: I'm pretty sure your talking about a Cold Front.
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Answer:
Protists are a diverse collection of organisms. While exceptions exist, they are primarily microscopic and unicellular, or made up of a single cell. The cells of protists are highly organized with a nucleus and specialized cellular machinery called organelles.
Kingdom Protista is said to be the most diverse kingdom, because each of its members are so individual from each other. If an organism does not belong any particular kingdom, it goes into kingdom Protista. ... This miscellanous grouping causes the organisms in the kingdom to be very different from each other.
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