Fatema grew up in Iraq and often heard gunfire and explosions near her home, which caused her alarm and anxiety. She moved to the United States, and during her first Fourth of July celebration, she was very startled by the loud booming and explosive sound of the fireworks. Fatema's startled reaction in response to the sound of the fireworks is BEST described as an example of: acquisition.
learned helplessness.
discrimination.
generalization.

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

What is the difference between bacterial infections and viral infections?

Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating