Why does a cis fatty acid have a kinked shape?

Steric hindrance in the cis orientation causes the chain to take on a more bent shape. Most natural unsaturated fatty acids are in the cis conformation. As can be seen in Figure 2.327, the cis fatty acids have a more of kinked shape, which means they do not pack together as well as the saturated or trans fatty acids

Explanation:

b. the carbon cycle ensures living things have a source of hydrogen