Who was Lucy, the Australopithecus afarensis? A
a scientist who came up with the system of classification
B
an extinct hominid who lived about 3 million years ago
С
a paleoanthropologist who discovered an extinct hominid
D
the last known member of the order Primates

c i believe

Explanation:

Good luck and sorry if im wrong

answer; i believe that the correct answer is (a) potassium(k)

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.