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Home Q & A Board Biology-Related Homework Help General Biology
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10 years ago
1. A trilobite is considered an index fossil because this organism existed during a  limited period in Earth's history. That means that any fossil located in a layer of rock beneath a layer containing trilobite fossils is ____________ than a trilobite.

2. According to this diagram, monotremes, marsupials, and placentals have the same _________ known as therapsid.

For this one, there is a cladogram with the therapsid at the bottom and the monotremes and marsupials on the top.

I think 1 is "older" and 2. is "ancestor."
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10 years ago
Both correct imo.
Pretty fly for a SciGuy
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