Answer:
be happy
Explanation:
get enough rest and eat good
Clues such as fossils such as bones, footprints, tar, etc, preserved underground helped inform scientists. You can also count how old a tree is when you cut it open and there are some alive for thousands of years so that is a possible way.
I believe it is azotemia.
Mendel realized that the principles of probability could be used to predict the results of genetic crosses.