Certain genes/cells are activated/turned on (how ever you want to word it)
The answer is b. nematocyst. (hope this helps!)
A, it takes years upon years for a glacier to move even a few feet.
In physics, escape velocity is the speed where the kinetic energy of an object is equal to the magnitude of its gravitational potential energy.
This relates to the speed at which an object should travel to "break" free of any gravitational pull.
Venus: 10.46 km/s
Mars: 5.027 km/s
The pyramid of energy <span />