Sources. For each of the following unsaturated fatty acids, indicate whether the biosynthetic precursor in animals is palmitoleate, oleate, linoleate, or linolenate.
(a) 18: 1 cis- $\Delta^{11}$
(b) 18: 3 cis- $\Delta^{6}, \Delta^{9}, \Delta^{12}$
(c) 20: 2 cis- $\Delta^{11}, \Delta^{14}$
(d) 20: 3 cis- $\Delta^{5}, \Delta^{8}, \Delta^{11}$
(e) 22: 1 cis- $\Delta^{13}$
(f) $22: 6 \operatorname{cis}-\Delta^{4}, \Delta^{7}, \Delta^{10}, \Delta^{13}$
$\Delta^{16}, \Delta^{19}$