Why should you include weight training as part of your exercise routine? 1. To increase muscle mass 2. To increase bone density 3. To increase flexibility - A. Only 1 B. Only 2 C. 1 and 2 D. 1, 2, and 3. No links pls answer correctly and only if you know the answer. I think it’s d tho will give brainliest if right

The flame produced by the burner of a gas (propane) grill is a pale blue color when enough air mixes with the propane (c3h8) to burn it completely. for every gram of propane that flows through the burner, what volume of air is needed to burn it completely? assume that the temperature of the burner is 195.0°c, the pressure is 1.05 atm, and the mole fraction of o2 in air is 0.210.