$\begin{array}{1 1} \text{a. Dioecious (hermaphrodite) organisms are seen only in animals.} \\ \text{b. Dioecious organisms are seen in both plants and animals.} \\ \text{c. Dioecious organisms are seen only in plants} \\ \text{d.Dioecious organisms are seen in vertebrates.}
\end{array} $
