A lab balance capable of weighing up to 100 g is often checked and adjusted to make sure it reads 0.00 with nothing placed on it and 100.00 when a known standard is placed on it. This process is referred as

you did not give any options thus this is the best answer i can give to you with this little information you have given

> they are both natural and not man made

> they can be tracked and predicted by the right tools

-love shrooms