How does the energy content of fat compare to the energy content of carbohydrates?

What is the 77 element on the periodtic table

According to the cladogram, which organisms have roundworms as a common ancestor?

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