Answer:
B.) Cross-country skiing; tennis
Hope this helps :)
 
        
                    
             
        
        
        
Answer:
a) The absence of glucose in diet causes oxaloacetate to drop and also slows down the citric acid cycle.
b) odd numbered.
Explanation:
a) glucose gives out pyruvate through the process of glycolysis, and pyruvate is the main source of oxaloacetate. The absence of glucose in diet causes a drop in oxaloacetate and slows down the citric acid cycle.
b) odd numbered. The conversion of propionate to succinyl CoA provides a medium for both the citric acid cycle and four carbon precursors for gluconeogenesis.
 
        
             
        
        
        
Eat More. You need to eat more calories than you burn in order to gain weight. Most guys will need at least 3000kcal/day, skinny guys with fast metabolisms will need even more. Start eating at least four meals a day – breakfast, lunch, dinner, post workout. Eat your stomach full on each meal.
Get Stronger. Strength is size. Increase your Squat to 140kg/300lb, increase your Bench Press to 100kg/220lb, and increase your Deadlift to 180kg/400lb. This will increase your overall muscle mass.
Rest. Muscles grow when at rest. Give your arms a break, they’re small muscles. Check StrongLifts 5×5: the routine allows for plenty of rest.
Track Progress. Weigh yourself and measure your arms every 2 weeks. If your arms aren’t getting bigger you’re not training properly or not eating enough food.
Avoid Curls. Increasing your Squat & Deadlift will build your arms faster than biceps curls & triceps extensions. Get stronger and eat more.
Exercises:
Downward dog push-ups. This is the start of your downward dog push-ups. 
Chair dips. You can do chair dips anywhere. ...
Towel curl. Use a towel to get the biceps of your dreams. ...
Elevated pike push-up. Try out these pike push-ups for a challenge. ...
Single-leg tricep dip. ...
Inverted rows. ...
Band push-downs. ...
Lateral plank walk
Do 3 sets of 8-12 reps, rest 90 seconds between sets.