PLEASE ANSWER URGENT Which shows the correct sequence of steps involved in sexual reproduction?

A. meiosis produces sex cells, egg and sperm join, zygote forms, new organism develops
B. egg and sperm join, zygote forms, meiosis produces sex cells, new organism develops
C. new organism develops, zygote forms, egg and sperm join, meiosis produces sex cells
D. zygote forms, egg and sperm join, meiosis produces sex cells, new organism develops

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 these serves as a reference for comparison during a scientific investigation? a)outcome variable (dependent variable) b) test variable (independent variable) c)control group d)hypothesis

Nerve cells are specialized to respond to stimulitrue or false?