Answer:
C. Concentration gradient
I think the answer would be soot appears on a fireplace after a fire. I hope this helps you out! Good luck!
Answer:
six
Explanation:
Professor of Chemistry, University of Minnesota, Minneapolis. Oxygen group element, also called chalcogen, any of the six chemical elements making up Group 16 (VIa) of the periodic classification—namely, oxygen (O), sulfur (S), selenium (Se), tellurium (Te), polonium (Po), and livermorium (Lv).
<span>What is an ecological system called that consist of all of it to biotic and abiotic factors?
</span><span>B. Ecosystem
I hope helped (^-^)
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