18. Jack is walking around the beach. He come across a smooth rock formation covered in something that looks like the fo

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18. Jack is walking around the beach. He come across a
smooth rock formation covered in something that looks like the
footprints of a large ancient creature. This is an example of a
_________ fossil.
a. trace
b. permineralized
c. frozen
d. cast
19. Jack is researching about the mechanisms underlying
large genome size in species of salamanders. What would provide a
better explanation for changes in genome size?
a. proportion of transposable elements
b. number of chromosomes
c. behavioral complexity
d. body size
e. number of protein coding genes