Producers are important parts of which cycle?

a only the water and the carbon cycle
b the nitrogen cycle, water cycle, and carbon cycle
c only the nitrogen cycle
d only the water cycle

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 of the following is a common response to cell signaling?

Which of these is not a nucleotide base found in dna?