A team of scientists is studying the fossils in the cross-section of rock shown below. 2.
3
4
5
6
7
In which layers of rock are the oldest leaf and fish fossils found?
оа
Ob
layers 2 and 4
layers 1 and 3
layers 6 and 7
layers 3 and 7
с
Od

Aboy with an extra x chromosome probably has which of the following syndromes?

The energy available as a result of the motion of a body is called energy. -potential -gravitational -kinetic -chemical

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.