Which pair of scientists should Elizabeth write instead of X
and Y?
Elizabeth was studying the history of the cell theory and the
contributions of different scientists. She made this table to
compare two of the scientists.
X
Schwann and Hooke
Hooke and Schleiden
Hooke and Leeuwenhoek
Virchow and Schwann
observed objects using a
microscope
observed small organisms
using his own version of a
microscope
called what he observed
"animalcules
called what he observed
'cells

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.