Answer: A large amount of energy is lost at each level, so there has to be a limit on the number of trophic levels.
Explanation:
Well since there no multiple choice I will tell you about the generation going now. Throughout history people have been expanding the use technology and a problem that this generation is using the resource given to you. So a concern that I suggest is the expansion of resources. Although some people don't use this because some families believe technology is not what "God" made so they don't bother to use and pushes this onto there kids.
B. The Russian president can create laws independently
This is known as cognitive jealousy. Envy is conceptualized as a cognitive, behavioral, and emotional to a relationship danger. So we will center around the cognitive since this is the appropriate response. This is the recurrence of a man's doubts and stresses with respect to accomplice enthusiasm for an opponent, and intrigue got from an adversary.