Sketch or include a screen shot of what you observe when examining the onion root tip using the low-power lens and the high-power lens. label the sketches or write a brief description of your observations. (you should have 2 drawings or 2 screen shots.)

What was the land like over 500 million years ago? what was under the sea?

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.

Which organism can most likely be classifild as domain bateria