Make their own food
<span> </span>Plants<span> make their own food in a process called photosynthesis.</span>
ATP or NADAP which is cycled
Wow this is phrased rather difficult.
My answer would definitely would probably be "C".
Remember that the 10% rule only applies towards energy. Since energy is no indication of healthiness all trophic levels are healthy in their own way.
Answer: It is because it makes it more efficient to study organisms.
Explanation: Biologist classify organisms by considering similarities between them. The organisms which have closely related characteristics are placed in a separate domains by biologists. Domains are further divided into 6 Kingdoms. According to modern classification system, domain is largest unit of biological classification.