1. the first choice , hope that helped
Answer:
A
Explanation:
Arrows show the flow of energy after photosynthesis takes place
Cigarette smoking and environmental chemicals
Tobacco smoke and certain environmental chemicals are known carcinogens (substances that can cause cancer in living tissue). The tobacco smoke from cigarette smoking contains harmful chemicals such as hydrogen cyanide, arsenic, ammonia, benzene, and many more. In fact, from 2009 to 2013, three out of 10 cancer deaths in the U.S have been attributed to cigarette smoking or exposure to tobacco smoke.
So it is the concentration of carbon dioxide<span> that plays the major part in governing the</span>rate<span> and depth of </span>breathing<span>. ... This produces an increase in the </span>rate<span> of lung ventilation, which quickly brings the CO</span>2<span> concentration of the alveolar air, and then of the blood, back to normal levels.</span>
The lymphatic system is responsible for transporting fat-soluble nutrients from the digestive system to the bloodstream.
