Answer:
Protein
EXPLANATION:
All of these substances are produced from protein metabolism.
DDT is used to repel and kill disease carrying mosquitos <span />
C<span>hloroplasts, which are only found in plants, give plants the green color because chlorophyll, a green pigment that helps in photosynthesis, is located inside of them</span>
Heat & Pressure ( So I guess in this answer choices it's " Heat up" )
The reason it's not " melt " because if melting were to take place then that would make Magma, and magma isn't metamorphic rock.
