The horsehoe crab because it was one of the first animals to ever live on earth
Answer:
<em>TO Determine whether Organic or not Just take some crystals on the end of a spatula and then introduce it in a flame, if it is melts or burns without white vapors then it is an inorganic compound and if you see white vapors or smoky vapors, it is organic. This is a very basic test which is used for this purpose.</em>
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<em>idk the second one..</em>
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(A)Until the onset of PUBERTY,
Answer: the earth was just starting to develop really well and well enough for life.
Explanation: atmospheric oxygen and oceanic calcium levels went up, but nobody needs to know that much facts about how earth developed, But the group called phyla started growing because of these conditions
