The answer is B, decomposers.
Our environment is what houses and helps our ecosystem grow and thrive. Without protecting and taking care of our environment we're putting so many lives at danger such as animals, plants and crops, and even our own. All of the ecosystems that make up our environment are deeply connected.
Because they are made to perform two different functions. Cells are part of tissues that are part of organs that perform a certain function. For example, your bone cells are made to make blood cells, so they wouldn’t be in your lungs as well.