By comparing fossils in higher sedimentary layers with fossils in lower sedimentary layers, scientists can learn which of the following?
which types of organisms were more common during various time periods
the relative age of different species
how species have evolved over time

How many chromosomes does each human cell contain? a. 23 chromosomes b. 26 chromosomes c. 43 chromosomes d. 46 chromosomes

Which nucleotide component contains nitrogen

What happens as electrons move along the chain of molecules known as the electron transport chain? they gain energy, which causes atp molecules to lose phosphate groups. they gain energy, which causes h *ions to join with oxygen to produce water. they lose energy, which is then used by the cell to make atp. they lose energy, which is then used to break down atp.