I think the correct answer from the choices listed above is option D. The organism that would probably be the first to grow on a new volcanic island would be grasses since it is the organism that is easiest to grow. Grasses grow almost everywhere. Hope this answers the question.
Answer:
because they are made of dead antibacteriol organism that are as a result of animal and plants decaying to form matter hence referred as composing layer
A biome is defined as the large ecological area where the formation of plants and animals with common characteristics gather due to the similar climates. If I were an ecologist, and i will be determining whether an entire river and lake biome is being threatened by human activity, the indicator species that i might look for are the ones that have been introduced into the biome.