Question

due to their \lifestyle\, which of the following organisms will have the greatest need for oxygen delivery to their cells and tissues and subsequent high metabolic rates?
a birds and mammals
b arthropods
c amphibians
d reptiles

Explanation:

Birds and mammals are endothermic (warm - blooded). They maintain a constant body temperature through metabolic heat production. This requires a high rate of cellular respiration (which uses oxygen) to generate the necessary energy. Arthropods are ectothermic (cold - blooded) and have lower metabolic rates. Amphibians and reptiles are also ectothermic. Their metabolic rates are generally lower compared to endothermic animals as they rely more on external heat sources to regulate body temperature.

Answer:

A. birds and mammals