b) layers below are less likely to yield reliable dates
c) when one layer overlies another, the one on top is usually more recent
d) layers on top are unlikely to have reliable, datable artifacts
e) layers on top are more important than those below
Isotopic analysis of human tooth enamel or bone collagen relies on
a) the presence of phytolithis
b) whether the person ate sugar or not
c) reading the chemical signature left in the body by different foods
d) the amount of calcium a person consumed in later life
e) how well an individual cared for their teeth
For most of human history the only way that people could measure time was through
a) the use of calendars
b) observing the alternating darkness of day and night and the cycle of the seasons