Some species of hares are brown most of the year, but change color to white in the winter. This allows them to blend in through the seasons.
Where are these organisms adapted to live?
© deciduous forests
O demert
© tropical rain forests
•
savanna

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.