The box below shows a list of supplies that are available in a laboratory.
• four flasks with stoppers
• floodlight
• tap water
• graduated cylinders
• small aquarium plants
• four small fish
• bromthymol blue (a chemical indicator
that changes color from blue to yellow as
the level of carbon dioxide in a solution
increases)
The class sets up an experiment with the four
flasks as shown
Pusk : 100 ml water, I ml bronhymol bloc, plant
Flask 2: 100ml. water, 1 ml brothymol blue, 2 small fish
Plack 3: 100 ml water, I mlbrothymol blue, 2 small fish, plant
Flask 4 100 mL water, Im brothymol blue
Which flasks contain organisms undergoing photosynthesis

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.