The Galapagos Islands are home to a variety of finches. Charles Darwin observed the finches on the island and noticed that each species was well suited to the life it led. For
example, finches that ate insects had sharp, slender beaks; finches that ate seeds had
strong, wide beaks. Beak shape in these finches is an example of -
adantation

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8