00:01
What is the shell of diatoms made up of? well, if you notice diatoms have this glassy appearance.
00:12
And glass is made up of basically silica.
00:17
So because diatoms looks glassy, then that's a sign that the shell is made up of silica.
00:26
So that's sort of like one way of visually confirming.
00:30
Obviously, there's other tests that you can do to confirm the chemical composition, but the main component of a diatom shell is silica.
00:39
Diatoms are basically single -celled algae that live in water, and they are very important to the ecosystem because they produce something like 20 % of the oxygen on earth.
00:52
So very important, these guys.
00:54
Let's look at the other choices that we have here...