Chapter 22, Problem 5MC

Houseflies develop through a series of programmed stages from egg, to larva, to pupa, to flying adult. This series of stages is called: a. artificial selection. b. respiration. c. homeostasis. d. a life cycle. e. metabolism.

An open circulatory system (a) is characteristic of squids and other active mollusks (b) permits contracting muscles to recover quickly (c) has no blood vessels (d) is a unique characteristic of annelids (e) has hemolymph, which bathes tissues directly

Which of the following characteristics does not contribute to powered flight in birds? a. a lightweight skeleton b. efficient respiratory and circulatory systems c. enlarged forelimbs and a keeled sternum d. a high metabolic rate that releases energy from food rapidly e. scaly skin on the legs and feet