Some organisms use uncommon amino acids in synthesizing specialized proteins. Homoserine and homocysteine (pictured) are used in metabolism as intermediates in the production of common amino acids. Some scientists believe that homoserine and homocysteine could be used in proteins. Which of these could function as an amino acid in proteins?

The earth's inner core is the earth's innermost part. it is primarily a solid ball with a radius of about 1,220 km (760 miles), which is about 70% of the moon's radius.[1][2] it is composed of an iron–nickel alloy and some light elements. the temperature at the inner core's surface is approximately 5,700 k (5,430 °c), which is about the temperature at the surface of the sun. 

Idon’t know the answer