This is a slide of human cheek cells. after scraping the inside of their mouths, students in ms. gordon's class smeared the swab on a slide and stained them blue. these cells are parts of a large, complex organism, a human. but these cells. like the other cells in the human body all have an important organelle, seen here. it stains dark blue and is the control center of the cell. what is this organelle? a) dna b) cytoplasm c) membrane d) nucleus

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

This is the process of making a prediction based on the results of prior observations of similar events.

which is an effect of short-term environmental changes? a) adaptation b) speciation c) extinction d) death (5 points)