Cell-based Culturing has advanced flu vaccines
Energy provided by macronutrients is measured in Kilocalories.
I have to go with B due to the fact, that emissions from cars are most harmful to the environment. Most notably the oxygen in which we breathe in.
Five stages of change can be distinguished: pre-contemplation, contemplation, preparation, action and maintenance. In the pre-contemplation stage, people are not considering increasing their physical activity level, at least not within 6 months.
