Nonrenewable mineral resources are often used as fuel. which choice is a good way to conserve the nonrenewable resources we now use for fuel?
a) use charcoal, obtained by burning wood for fuel.
b) use coal in thermal power plants to obtain energy.
c) explore alternative sources of energy, such as solar energy.
d) extract minerals from the sea, leaving the resources on land untouched.

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