1. The leopard shares a most recent common ancestor with which other organism? 2. Which organism do you think would be considered the oldest? Why? 3. Which organism is more closely related to the tuna? Lamprey or turtle?

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area

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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.