B because there are too many deer so they all can't have enough food so the die.
Lipase................................
Explanation:
Each D-T fusion event releases 17.6 MeV (2.8 x 10-12 joule, compared with 200 MeV for a U-235 fission and 3-4 MeV for D-D fusion). On a mass basis, the D-T fusion reaction releases over four times as much energy as uranium fission. :):)
Optical microscope.
Hope this helps.
The answer would be -- A. Cenozoic