Busy Bees

 is the 51st level in Bloons 2, and the 3rd level in the Rubber Jungle zone.

Solution
There are two zones to target: the Tack Bloon at the very right, and the rest of the zone. Get the throwing of the rightwards Tack Bloon correct first. Then try practice timing top-left Tack Bloon targeting and let the Bee Bloon pop on the same shot, but make sure the timing of the moving Bee Bloon is correct to where the dart trajectory would land. Or do the order of the two target zones the other way round if that's more comfortable. Either way, for the Bee Bloon step, make sure it hits the bottom Tack Bloon and the right bricks and then the Layered Green Bloons.