Why does the author include this excerpt? to define key terms to establish credibility to clearly explain the topic to offer background information.

Living organism in our word are connected to other variety of ways

While trees are not the largest level in the pyramid of numbers, they are still the base for both the pyramids of biomass and pyramids of energy. select the best answer from the choices provided t f

Arecent survey shows that the probability of a college student drinking alcohol is 0.6. further, given that the student is over 21 years old, the probability of drinking alcohol is 0.8. it is also known that 30% of the college students are over 21 years old. the probability of drinking or being over 21 years old is