An archaeopteryx was a dinosaur that was similar to a bird.
How would a scientist find evidence that supports this statement?
A. Examine fossils of archaeopteryx and look for structures similar to
those of modern birds.
B. Use an index fossil to determine the ages of fossils of
archaeopteryx and fossils of known birds.
C. Compare an archaeopteryx with other dinosaurs to see if they
have similar characteristics.
D. Explore the area where fossils of archaeopteryx were found and
see if there are any birds there.

Mouse liver cells were homogenized and the homogenate subjected to equilibrium density-gradient centrifugation with sucrose gradients. fractions obtained from these gradients were assayed for marker molecules (i.e., molecules that are limited to specific organelles). the results of these assays are shown in the figure. the marker molecules have the following functions: cytochrome oxidase is an enzyme involved in the process by which atp is formed in the complete aerobic degradation of glucose or fatty acids; ribosomal rna forms part of the protein-synthesizing ribosomes; catalase catalyzes decomposition of hydrogen peroxide; acid phosphatase hydrolysis monophosphoric esters at acid ph; cytidylyltransferase is involved in phospholipid biosynthesis; and amino acid permease aids in transport of amino acids across membranes. a) name the marker molecule and give the number of the fraction that is most enriched for each of the following cell components: lysosomes; peroxisomes; mitochondria; plasma membrane; rough endoplasmic reticulum; smooth endoplasmic reticulum.