Base your answers to questions one through three on the geologic cross-section below, which shows rock units one through seven that have not been overturned. Some of the rock units contain New York State index fossils. And uncomfortably exists between rock units five and six. 1. What evidence shown in the cross-section indicates that the basalt rock unit is the youngest rock unit?

2. Bed rock from which entire geologic time period is missing between rock units five and six?

3. Describe one characteristic of volcanic ash layer is an index fossils that make both of them good geologic time markers

Specialized cells which perform a particular function form : organisms organs tissues

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.

The effect of a hormone on a target cell may be decreased by the presence of