Which statements describe the movement of blood through the heart? check all that apply.

blood from the veins enters the ventricles.

atria and ventricles contract at the same time.

atria push blood into the ventricles.

valves allow for two-way blood flow.

ventricles push blood out of the heart.

In the african savanna,more wildebeests are born than the environment can support. which is most likely to happen over a period of years as a result

Do you think the gene eef1 alpha1 supports cell theory? explain your response.

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.