What do biologists use to establish whether or not two organisms are the same species

Are salt and soap nutrients or toxins for yeast? explain.

What is the importantence of the carbon and nitretan cycles in the environment

Johnny rode his bike 4 blicks down the street to his friend's house once he got to his friend house and realized he could not cone out to play he turned aroubd and went back home. what is displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point