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>
Answer: Environmental conditions, such as temperature and availability of nutrients can affect phenotypes. For example, temperature affects coat color in Siamese cats. ... Height in humans is a complex phenotype influenced by many genes, but it is also influenced by nutrition
Explanation: Hope this helps luv :)
It would be all if u can pick that but if not it depends on what animal the he question is talking about
