How do scientists know when oxygen first appeared in the Earth's atmosphere?
The mass extinction of Archaea.
The decrease of CO2 in the Earth's atmosphere.
o The formation of snowball Earth.
o The appearance of red banded sedimentary rock
which was produced when oxygen reacted with and
precipitated dissolved iron in the oceans.

The correct answer is c

Noble gases is far right

Deposition is the transition of matter going from gas to solid without passing through the liquid phase.a.) gas—-> solid

Answerd. may include all of these are many definitions of bases: the  brønsted-lowry definition of acids and bases says that bases are proton acceptors.the arrhenius definition of acids and bases says that bases increase [oh⁻] in solution (thereby producing oh⁻ ions)the lewis definition of acids and bases says that bases donate electron pairs.therefore, the sensible answer is that a base may include all of the described characteristics.