Most cnidarians are known to produce toxins. In fact, it has been claimed that one particular species produces the most deadly of all toxins on the planet. What feature of this group most likely evolved simultaneously with the evolution of these toxins?
A) the medusa body form
B) asexual reproduction
C) a slow-moving or sessile lifestyle in the adult
D) diploblastic design
E) bilateral symmetry in the mobile larval forms

Question

Quizplus · Accepted Answer

The evolution of toxins in cnidarians is believed to have occurred as a means of defense against predation. A slow-moving or sessile lifestyle in the adult would increase the need for a strong defense mechanism against potential predators, and therefore is the most likely feature to have evolved simultaneously with the production of toxins.

Most Cnidarians Are Known to Produce Toxins