Half life is the time taken by a radioactive isotope to decay by half of its original mass. In this case the half life of carbon-14 is 5500 years.
The original mass is 30 g and the new mass is 3.75 g.
New mass = Original mass × (1/2)^n, where n is the number of half lives;
3.75 = 30 × (1/2)^n
1/8 = (1/2)^n
n = 3
Thus, the time taken will be; 3 × 5500 = 16500 years.
Answer:
The transport of seed from one environment to other environment is known as pollination. There are different factors which does this job.
Explanation:
The transportation of pollen grains from one place to another is done other by natural process or by human process.
In natural process the transportation is done either by wind or by the water. It may be carried by some birds, insects or animals accidentally or intentionally.
When the pollen grains are transferred by humans’ effort or by other mechanical efforts it is known as artificial process.
The pollen grains transferred from anther to the stigma of other plant in a favorable environment to have its further process.
Both answers b and d are macromolecules so either one would be correct. personally i would put b
