Answer:
"Biotic factors" is the awnser
Explanation:
The semilunar valve is usual peacemaker
D.
<span>ribosomes and mitochondria</span>
As you move to the right along a row in the periodic table, the <span>atomic mass increases.
Hope that helps. -UF aka Nadia</span>
<span>Scratch it against a streak plate to see the color of its residue.
And
</span><span>Hold light to it and examine its luster.
Along with
</span><span>Examine its texture and see if it's rough, smooth, or glassy.</span>