Question

what are the two phases of bird flight? flapping and speed ground and lift ground and speed speed and lift

Explanation:

Bird flight has a down - stroke (flapping to generate lift and thrust) and an up - stroke. Flapping is a key action in flight. Speed is a result of flight rather than a phase, and ground is a location not a flight phase. Lift is generated during flapping. So the two phases related to the mechanics of flight are flapping and the generation of lift which is part of the flapping motion.

Answer:

No correct option provided. The two main phases of bird flight are the down - stroke (power stroke) and up - stroke (recovery stroke) which are related to flapping. If we consider the options given in a more general sense and assume flapping as a key element, none of the provided options are completely accurate but if we had to choose the closest conceptually, flapping is involved in generating lift and is a fundamental part of flight, so an option related to flapping would be more appropriate than the others given.