The answer is B
Commensalism is when one organism benefits, but the other organism is neither harmed or helped.
Calculating waist to hip ratio. This is indicative of excessive fat accumulation (of a certain type) which could be indicative of a higher risk for cardiovascular diseases
It is recommended to eat about 4 grams of carbs for every pound of body weight per day. So, it means that Cynthia (55 kg ~ 121 pounds) needs to take in about 500 grams of carbohydrates daily. Carbohydrates are important nutrient for marathon athletes to consume when preparing for a marathon because the skeletal muscles are fuelled mainly by glucose derived from carbohydrates. Glucose is stored in the form of glycogen to promote a decrease in fatigue during the race.
Answer: D. A forest fire
Disturbance is an event of extreme environmental stress that
happens in a short period of time and can largely affect the ecosystem in the
area affected. Disturbances may either be due to natural phenomena or man-made.