I believe it's "pollen".
When the pollen grains are washed down into lakes/rivers, scientists can take a sample of the sediment layers and see what plants were growing at that time. They can then make inferences about the climate and how that affected the plants growing there.
Hope this helps!
Explanation:
the virus which can transfer from one person to another are called smart virus. example corona virus
Mendel's First Law! using chance and probability. I don't know ALL about it but look up mendel's first law and you'll get your answer
