Answer:
both breaking of nuclear bonds and the forming of nuclear bond will be the correct answer
The life-form during the Precambrian time was cyanobacteria.
The ecosystem that he should consider is the <span>tropical rain forest ecosystem.
In that area, there are uncountable amounts of various plants and animals that have not all yet been discovered and who all live together to build the biome. This biome is indeed the most diverse one even at this point without the knowledge of all possible life forms.</span>
Quadriceps is the answer I think you need. But the knee is a major part of the leg straightening to kick a ball not so much a muscle.