A unique feature of diatom cells is that they are enclosed within a cell wall made of silica<span> (hydrated silicon dioxide) called a </span><span>frustule.</span>
Hi there!
The definition of Oceanography is -
The study of the Ocean.
Hope this helps!
~Alexa
Answer:
the fourth one. biomagnofication is when an organism ingests other plants or animals that have toxins in them. the toxins are widely distributed
cannot breathe, is not a living organism, doesn't grow doesn't move
