The swim bladder of a fish keep the fish from sinking

a) increasing its weight
b) decreasing its weight
c) increasing its buoyancy
d) decreasing its buoyancy

It is really hard for me right know

Me with this and you will be marked brainliest

Ablue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.5 m/s 2 . a green car arrives at the position of the stop-light 6.5 s after the light had turned green. if t = 0 when the light turns green, at what time does the green car catch the blue car if the green car maintains the slowest constant speed necessary to catch up to the blue car? answer in units of s.