Answer: the steel wool in the 3.0 M HCl reacts fastest.
Explanation:
Answer: fossils are remains of dead or extinct animals/plants
Answer: its in the center
Explanation:
It spread by person to person
According to a source the answer is <span><u>Cyanobacteria were the first organisms to produce oxygen in water, which then escaped into the atmosphere.</u>
These cyanobacteria species were the first ones to "produce" oxygen as a by-product of the photosynthetic mechanisms which enables organisms to make their own food. </span>
