What are the commercial uses of yeast and bacteria? (not from google)

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

The table below shows the elements that mainly comprise each of the four layers of earth: elements in layers layer main elements crust oxygen, silicon mantle iron, magnesium outer core iron, nickel inner core iron which of these elements make up the layer that is 0.2 to 1.1 percent of earth's total diameter?

The nucleus is where are constructed? a. proteins b. mitochondria c. ribosomes d. endoplasmic reticulum