Over time, some plants growing in an area are crowded out by other plants. the new plants use up water and nutrients needed by the previous plants. the disappearance of the first plants is due to
a. primary succession
c. competitive exclusion
b. predation
d. parasitism

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

Which set of terms best describes a community of miners who live out in the countryside of west virginia and use specialized geological equipment to analyze the composition of rock?

"your temperature analysis reveals a pattern with coldest temperatures located to the portion of the map."