Pioneer species are the first species that colonize places where there were previously no other living organisms, such as algae that colonize bare rocks. ... Therefore, they pave the way for other species to establish themselves at the location through the creation of new potential ecological<span> niches.</span>
The answer is true light is one of the forms of electromagnetic energy.
Oxygen and hydrogen make up water
Ventilation systems are needed in a <span>multicellular organism to actually obtain oxygen and give out carbon dioxide. Without this ventilation system, it would be very difficult for multicellular organisms to survive. It has been also observed that surface diffusion is not enough for a multicellular organism to breath.</span>