As far as we are currently aware, who were the first people to notice the el niño southern oscillation cycle? group of answer choices colonial governors in south america from spain scientists studying atmospheric changes indigenous people in south america peruvian fishermen meteorologists

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

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

Apaleontologist finds a plant fossil that shows that the plant had seeds. what can the paleontologist conclude?