Answer:
The first three look like clear quartz then the last two might be obsidian
Explanation:
Tried my best hope this helps!
Answer:
My best recommendation is C.
Explanation:
I won't explain it because you should be able to figure it out using the process of elimination, but try C.
If the beavers need large teeth to collect wood for their dams, the population of beavers with larger teeth will live longer because they can collect wood. They will them be able to reproduce therefore passing down the gene with larger incisor teeth
Http://www.indiana.edu/~geol105/images/gaia_chapter_3/wegener.htm
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