What is the definition of a fossil? A. the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock
B. the body of a dead organism such as a dinosaur
C. the bones of an animal that has died and been buried in sand
D. something that is very old or ancient that has been found or studied by scientists

A. The remains or impression of a prehistoric organism preserved in a petrified form or as a mold or cast in a rock

Explanation:

A.the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.

it should be all of them because it asks if you included all of those in your answer

explanation: