What happens during rusting of an iron nail? Sulfur, iron, and oxygen combine to form iron sulfoxide.

Iron and oxygen combine to form iron oxide.

Iron and sulfur combine to form iron sulfide.

Sulfur and oxygen combine to form a sulfur dioxide coating.

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?

Plz ! what does it mean for an allele to be dominant?

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