What environmental factors could explain differences between breath holding and a "dive"?

Body position, temperature of water and pressure on the face.

Breath holding can be defined as a physiological adjustment that involve the cardiovascular, nervous and respiratory system that act in a manner that induces O2 conservation and blood flow diversion to the vital organs such as heart and brain. However, the environmental  factors that differentiate between breath holding and dive includes: body position, temperature of water and pressure on the face.

c. movement because i took the test and it lets me review my answers

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.