Please i need help asap i will do 30 points it is a weather question the only thing i know is that you have to add them all up and put them to percentages like 20/80 = 25%

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 of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs

What factors contribute to the effect an environmental toxin has on the human body?