D.
This is because if you’re in high air polluted areas your lungs could be affected.
If you exercise in heat you’re more likely to have a heat stroke or pass out, which are both dangerous.
If equipment is made for something specific, using it wrong could result in physical injury.
Fitbits, smart watches and pe'dometers can monitor heart-rate.
The answer is myosin, i just took the exammmmm :))
