Which of the following statements best explains why the energy_pyramid is narrowest (small) at the top? The diagram below shows an energy pyramid for an aquatic ecosystem.
Top
carnivores
Carnivores
Herbivores
Producers
The organisms at the top of the pyramid have the largest population sizes.
The organisms at the top of the pyramid need only a small amount of energy for their metabolism
The organisms at the top of the pyramid receive only a small fraction of the energy that originally enters
the system
The organisms at the top of the pyramid are the most efficient feeders.

In german cockroaches, curved wing (cv) is recessive to normal wing (cv+). bill, who is raising cockroaches in his dorm room, finds that the frequency of the gene for curved wings in his cockroach population is 0.6. in his friend joe’s apartment, the frequency of the gene for curved wings is 0.2. one day joe visits bill in his dorm room, and several cockroaches jump out of joe’s hair and join the population in bill’s room. bill estimates that, now, 10% of the cockroaches in his dorm room are individual roaches that jumped out of joe’s hair. what is the new frequency of curved wings among cockroaches in bill’s room? 0.69 0.4 0.5 0.31 0.20

The finches on the galapagos island were similar in form except for variations of their beaks. darwin observed that these variations were useful for: attracting a mate defending territory building nests gathering food

How do you know that the plant cells in these two images have different jobs, or functions? a. because all plant cells serve different functions b. because they are two different colors c. because their dna are different d. because their structures are different