Adult flatworms have symmetry. radial no bilateral none of the above

Bilateral symmetry

Explanation:

Bilateral symmetry is the symmetry in which when an organism is divided into two parts. When flatworms are cut into two halves by the central axis, then it is divided into two equal halves.

The bilateral symmetry of an organism creates two matching halves. If a line is drawn starting from the head of the organism which reaches to the tail divides the organism into two sides reflecting each other.

Hence, the correct answer is Option C

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.