The Earth was first considered habitable when we discovered that it was Microbial organisms that started the process. I would go with D.
The impact of invasive species is that it may cause environmental harm, economic harm, or impact human health.
Hope I helped
Answer:
The phylum platyhelminthes includes the organism like flatworms, earth worm and many other species. They play a major role in the marine, terrestrial and freshwater ecosystem. It contains a variety of nutrient sources.
Explanation:
They are of great importance from the times when there were no other organism.
