Which statement best compares pseudopods in sarcodina and flagella in dinoflagellates? A.
Both pseudopods and flagella are used for movement, but only pseudopods are used to engulf food.
B.
Both pseudopods and flagella are used for reproduction, but only flagella are used for movement.
C.
Pseudopods are whip-like structures, while flagella are flat structures involved in photosynthesis.
D.
Pseudopods are permanent projections from a cell, while flagella can be retracted into the cell.

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.