" genotype is the pair of genes an organism has for a particular trait. Phenotype is the observable trait present in the organism. For example, if you were to see the pea plants in a garden, the TT and Tt will both appear tall. And, if you saw the tt plant, it would appear short."
For the leaves to be presearved as fossil, they have to undergo a natural process of carbonization. This involves a slow chemical reaction with water over time that allows oxygen, nitrogen, and hydrogen to escape the leaves’ structure as gases leaving behind a carbon skeleton/film.