The perspective formula of threonine, an amino acid with two asymmetric centers, is provided below. perspective formula of threonine add either an h, oh, or nh2 group to complete the fischer projection for threonine.

The threonine add either an h, oh.The provide below standpoint formula of threonine add either an h, oh, or nh2 group to whole the fischer projection for threonine. the threonine aldolase structure there address of the reversible cleavage of several L-3-hydroxy-a-amino acids. like as L-TAs +H3NH. HOH. CH3. L-Threonine (2S, 3R).

Its the second one nonmetals are moldable and easily shaped 

The answer is 5 10 15