During combustion, methane yields carbon dioxide and water. the unbalanced equation for this reaction is: ch4(g) + o2(g) co2(g) + h2o(l) what will the mole ratios for the balanced equation be? (what coefficients are needed in order to balance this equation? ) a. 1 : 1 : 2 : 1 b. 5 : 4 : 3 : 6 c. 1 : 2 : 1 : 2 d. 1 : 1 : 1 : 2

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed