<span>B.) traffic congestion
</span><span>C.) increasing the temperature of the urban heat island</span>
In order to be classified as a living thing an organism must share or have the characteristics that define for what a living thing is ought to be, can grow and develop, can respond to stimuli in the environment, and more.
The most fundamental are that organisms must be composed of cells, regardless whether that it is prokaryotic and or eukaryotic. All living things must be made of cells.
The answer is A, because the phytoplankton is the foundation of this food web. Without your foundation, "the building will begin to crumble".
