What is the energy input and output for photosynthesis?

Which flexible structure that supports the nerve cord and led to the backbone

Which statement describes john tuzo wilson’s contribution to the theory of plate tectonics?

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.