Astudent is trying to match organ systems together according to their functions. which of the following organ systems are best paired in terms of their functions being opposite to one another?

a. immune and integumentary systems
b. nervous and endocrine systems
c. digestive and excretory systems
d. muscular and skeletal systems
e. circulatory and lymphatic systems

How are the testes and ovaries similar? a. both produce sex cells. b. both connect internal reproductive organs to the exterior. c. both transport sex cells from their site of production. d. both store mature sex cells.

If a grape were placed in a hypertonic solution what would happen and why?

Female luna moths (actias luna) attract males by emitting chemical signals that spread through the air. a male hundreds of meters away can detect these molecules and fly toward their source. the sensory organs responsible for this behavior are the comblike antennae visible in the photograph shown here. each filament of an antenna is equipped with thousands of receptor cells that detect the sex attractant. based on what you learned in this chapter, propose a hypothesis to account for the ability of the male moth to detect a specific molecule in the presence of many other molecules in the air. what predictions does your hypothesis make? design an experiment to test one of these predictions.