In 1950, erwin chargaff discovered that the percentage of adenine in dna equals the percentage of thymine, and that the percentage of cytosine equals the percentage of guanine. this proved invaluable to the eventual discovery of which aspect of dna?

Up until 1938, paleontologists accepted the idea that coelacanths (an ancient fish) went extinct at the time that they last appear in the fossil record, about 80 million years ago. but in 1938, a live coelacanth was discovered off the coast of south africa that was compared to the fossil record and found to be the same species what goal of science does this discovery represent

Which animal is a producer in this ecosystem

Overtime the pond slowly becomes more acidic due to the release of chemicals from a nearby factory. which of the organisms would most likely survive the change to their environment?