Indicate whether the following organs or structures are derived from (a) the ectoderm, (b) the endoderm, or (c) the mesoderm. (1) brain (2) thymus (3) kidneys (4) fingernails (5) heart (6)...

Indicate whether the following organs or structures are derived from (a) the ectoderm, (b) the endoderm, or (c) the mesoderm.

(1) brain

(2) thymus