I think the answer to your question is Magnetic.
They are ineffective against viral infections because viruses can not be treated with antibiotics.
Answer:
These organisms should be adapted to live in this enviroment, i.e., they need to have adaptations to breathe, to swim (fins), streamlined bodies to move through the water, to eat the food found in the region, etc. Moreover, in this environment, the diversity tends to be high because marine regions are often characterized by their richness.
I think the answer is B. Immigration must outpace emigration. Hope this helps!
