A poisonous gas that blocks the transport of oxygen by hemoglobin in the blood. It decreases the blood's ability to supply oxygen to its tissues, depriving the heart and other organs of the oxygen they need to function.

A. True
B. False

Which of the following choices is not an effective solution to the energy waste related to inefficient lighting? a. using low-pressure sodium lighting sources b. pointing lights on billboards and street signs upward c. placing light sources on time controls d. shielding light to direct it downward

The cluster of developing cells from conception until birth is called an

Which are reasons cells undergo cell division?