Which two systems are most directly involved in providing molecules needed for the synthesis of fats in human cells?

A. digestive and circulatory
B. excretory and digestive
C. immune and muscular
D. reproductive and circulatory

The two systems which are most directly involved in providing molecules needed for the synthesis of fats in human cells are Digestive system and Circulatory system.

Explanation:

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a- multicellular

b-eukaryotic

c-no cell wall

d-heterotrophic

e-autotrophic

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.