Phosphorylation cascades involving a series of protein kinases

depends on if you on plato or not

i'd say that the moon rock is about 2.2 billion years old.

linnaeus is the father of taxonomy

explanation:

which is the system of classifying and naming organisms. one of his contributions was the development of a hierarchical system of classification of nature. today, this system includes eight taxa: domain, kingdom, phylum, class, order, family, genus, and species.