A farm pond, usually dry during winter, has plenty of water and aquatic pond life during the summer. One summer, Sarah returns to the family farm from college. Observing the pond, she is fascinated by some six-legged organisms that can crawl about on submerged surfaces or, when disturbed, seemingly "jet" through the water. Watching further, she is able to conclude that the "mystery organisms" are ambush predators, and their prey includes everything from insects to small fish and tadpoles.
-If the pond organisms are larvae, rather than adults, Sarah should expect them to have all of the following structures, except
A) antennae.
B) an open circulatory system.
C) an exoskeleton of chitin.
D) complex eyes.
E) sex organs.

Question

Quizplus · Accepted Answer

Larvae, in the context of insects or similar organisms, typically do not have developed sex organs; these structures usually develop or mature in the adult stage of the organism. Antennae, an open circulatory system, an exoskeleton of chitin, and complex eyes are common features in both larval and adult stages of many aquatic insects.

A Farm Pond, Usually Dry During Winter, Has Plenty of Water