What evidence is Earth's Geological timescale mostley based from? A. Absoulute Age of Rocks
B. Geological Events and Lifeforms
C. Historical Records and Ancient Texts
D. Dinosaur Fossils and Metors

B. Geological Events and Lifeforms

Explanation:

The Earth's Geological time scale is mostly based on Geological Events and Lifeforms.

The Geological time scale provides a division of events on the earth into several time frames.

Each of the time units are based on events through the Earth's history and evolution of life.

The events are often recorded in rock strata and also as fossils which are the preserved remains of organisms.

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.