Is there anymore to the question?
I believe the best answer is D.
All answers contribute to a machine, if there is an all above choice, chose that.
Pressure Plates there is different types of plates also
An example for how the Paleozic
supercontinent ice cap melted is through plants dying off, which in turn, increased the greenhouse effect.
To add, <span>the
trapping of the sun's warmth in a planet's lower atmosphere due to the greater
transparency of the atmosphere to visible radiation from the sun than to
infrared radiation emitted from the planet's surface is called the greenhouse
effect.</span>