Answer:
Because it does. No other answer. This is one of those Impossible to Answer questions from college.
18.D
19.A
20.C
21.B
theses are going to be your answers
Answer:
50 atoms have decayed during that time
Explanation:
The radioactive decay is represented as

Where N is the amount of radioactive element after a certain time period
N0 is the amount of radioactive element during the initial time period
X is the half life of the radioactive element
Substituting the given values in above equation, we get:
atoms
So, 50 atoms of carbon-14 remain are left after decaying for 5700 years.
Hence, atoms of carbon-14 that decay during 5700 years are 100-50 - 50
The atmosphere had no oxygen it thereby created an environment where only anaerobic organisms could exist. They couldn't make there own food due to lake of oxygen in the atmosphere