What is the atomic mass (mass number) of this atom?
a
b, c
09
04
08
O1
O

answer: 45

explanationyou have to add as well to be it could be

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation:

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]