Which law of thermodynamics states that "useful energy in >
useful energy out"?
A. 10th
B. 2nd
C. 3rd
D. 4th
ive been struggling over this please help

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

the answer is c a tornado

c is the answer to this question. altitude affects the weather because air molecules evaporate.

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .