Fluorescent dyes can be added to groundwater in order to trace the waters path. A researcher placed some fluorescent dye into a stream. Which of the following is the most direct route for the dyed water to take to the ocean?
A. Via an aquifer
B. Via thermohaline circulation
C. Via a closed watershed
D. Via an open watershed

Regarding most of the narrator’s story, which word best describes the tone?

What do nitrifying bacteria convert

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