1. The passage above describes the interactions of several ecosystems, what is the overall theme of the entire article? "UNDERLINE the sentence that serves as the topic sentence or thesis for the article.
a) to compare the food chains of each ecosystem
b) to convince the reader to protect the environment
c) to explain what keystone species are important in each ecosystem

there’s no image attached but i can if you want: )

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.