It is hypothesized that RNA may have evolved before DNA because RNA molecules A. were the first molecules synthesized by Miller and Urey
B. are more important to genetic inheritance than DNA
C. can catalyze a variety of biologically important reactions
D. are found in more modern cells than are DNA molecules

Which of the following occurs after a natural or unnatural disturbance in an ecosystem

New york city has 2,181 inhabitants per square mile. the state of alaska has 1.03 inhabitants per square mile. ecologists would say alaska has a low exponential growth population density birth rate carrying capacity

Which organelles are labeled d, and what is one feature that distinguishes them from the other labeled organelles chloroplasts the only organelles that produce sugars from sunlight mosomes, only found in animal and bacterial cells centricles only found in animal cells mitochondra, the only energo-generating structures found in cells