Answer: It was obtained 8515 years ago
Explanation:
Expression for rate law for first order kinetics is given by:

where,
k = rate constant
t = age of sample
a = let initial amount of the reactant
a - x = amount left after decay process
a) to find the rate constant:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.


b) for completion of 36% of reaction


t = 8515 years
The time was 8515 years.
It should be Ozone, hope that helps.
Trees release CO2 which is Oxygen.
Plants release water vapor through Photosynthesis.
Answer:
The moon, sun, river, clouds, mountain, rain, water and so on.
hope that helps if not sorry
Answer:
The water would get warmer and would not sink to the bottom, and therefore disrupt the worldwide currents
Explanation:
the warmer water is less dense than the colder water and would not sink, which would interrupt the natural currents with extra external heat added by global warming