What are all the products of a hydrocarbon combustion reaction? A. Hydrogen, carbon, and oxygen
B. Carbon dioxide, water vapor, and heat
C. Oxygen, a carbon-based molecule, and heat
D. Carbon dioxide, oxygen, and water

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

answer: they produce more slow than unicellular organisms.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.