The heterotropic hypothesis is the strongest and most accepted hypothesis about the origin of life on earth. which of the following statements best supports this hypothesis? a: the first living cells were plants. b: the first living cells had a nucleus. c: the first living cells were multicellular. d: the first living cells could not make their own food.

D. is the heterotrophism hypothesis, but it is questionable that it is the "strongest" hypothesis. The alternately proposed option is autotrophism, which is the ability of an organism to obtain its own nutrients without relying on other organic materials. The potential advantage of autotrophism is its relatively simpler structure, making a simpler organism viable because it is potentially less complex and "easier to create."

bc blah

explanation:

bc blah

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.