33. which stimulus tests the absolute threshold of vision?
a) hair cells of the inner ear
b) electromagnetic energy
c) chemical substances in the air
d) a ticking watch in a quiet room
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What the theory that the sun goes around earth was replaced with the theory that earth goes around the sun this was an exaple of a

What did hunter gathers do to alter the environment?

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures