The food web below represents the organisms that make up a freshwater ecosystem.
Suppose humans accidentally introduce a nonnative species of carnivorous bird to the region. If these birds feed exclusively on
large fish, which group or groups of organisms will be negatively impacted by this change?
insects
large fish
carnivorous mammals
ducks
aquatic plants
snails
cranes
small fish
(multiple choice)

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.