The answer is C. High birth rates
High birth rates or overpopulation is one of the most pressing environmental issues today. It silently is the largest contributor to environmental pollution, global warming, loss of habitat for animals as the wild is converted to cities and housing. INtensive farming practices to increase food supply also aggravates the situation. Moreover, the consumption of natural resources and the slow reaction to preserve it endangers life existence.
distributing fluorescent light bulbs
B) Viens
The veins have valves to keep the blood pumping out and not coming back in the heart.
