Which is evidence of climate change due to geological evolution? *
a. index fossils found in desert areas
b. dry streambeds found in some areas
c. fossils from tropical plants found in arctic regions
d. a lack of fossils in arctic areas?

Which system revise and send electrical signals throughout the body

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

Explain why ecosystem diversity results in species diversity in a healthy biosphere