Order the sequence of events that occurs in the Hypothalamic-pituitary-thyroid axis to control thyroid hormone secretions. Situation: The body "senses" low T3 and T4 hormone concentrations in the blood.

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 diagram best represents the chromosomes that would be found in a two new skin cells produced as a result of this process?

Everything in the universe originated from a single point. how was it possible for everything in the universe to have occupied a single point in space?