That element is iron.
Given that olivine, pyroxene, amphibole, and biotite are all minerals found in mafic igneous rocks, the answer is quite simple if you know something about such rocks. Mafic rocks contain elevated amounts of iron, which makes them dark in color.
Answer:
by seeing the results of his experiments
Explanation:
<span>Based on the
cladogram, mackerel has segmented body and jaws. They have vertical stripes on
their backs and fork tails. In addition, mackerel is a multicellular species of
pelagic fish, which were restricted in their distribution ranges and live in
separate populations.</span>
