​An ecosystem that retains a high biodiversity (that is, a wide varietyof living things)is much more likely to adapt to human-caused environment change than is one that has little.

Considerthe two food webs shown in the diagram. The arrows pointfrom the

5      organism that gets eaten to the one that eats it. These food webs are highly simplified comparedwith food webs in real ecosystems, but they still illustrate a key difference between more diverse and less diverseecosystems.

Food web B represents a situation with very low biodiversity, where at some levels the food path involves only a singletype of organism. Food web A represents

10       a more diverse ecosystem with, as a result, many more alternative feeding pathways.

Generally, loss of biodiversity shouldbe regarded seriously, not only because the organisms that have becomeextinct represent a big loss for both ethicaland utilitarian (useful benefit) reasons,but also becausethe organisms that remain have become more vulnerable (exposed) to extinction in the future.

In lines 9 and 10 it is stated that “Food web A represents a more diverseecosystem with, as a result, many more alternative feeding pathways.”

Look at FOOD WEB A. Only two animals in this food web have three direct (immediate) food sources. Which two animals are they?