Question

1. which fossil would make the best index fossil? a. beetle b. flower c. frog d. fish outcrop #1 outcrop #2

Explanation:

To determine the best index fossil, we analyze the presence of fossils in Outcrop #1 and Outcrop #2. An index fossil should be widespread (found in multiple outcrops) and have a short geological range. Looking at the options:

• Option A (Beetle): Check its presence. In Outcrop #1 (orange section) and Outcrop #2 (orange section), the beetle - like fossil is present. It appears to be consistent across the outcrops, suggesting it might have a short - lived existence and wide distribution, fitting the index fossil criteria.
• Option B (Flower): Flowers are part of the plant kingdom. The fossil record of plants, especially flowers (angiosperms) has a relatively long geological history in some cases, and from the outcrops, it's not clear if it's as consistent as the beetle - like fossil.
• Option C (Frog): Frogs are amphibians. Their fossil record might not be as widespread or have as short a range as needed for an index fossil, and from the outcrops, the frog - like fossil doesn't seem to be as consistently present as the beetle - like one.
• Option D (Fish): Fish have a long evolutionary history, and their fossils are often more widespread in time (longer geological range) rather than being good index fossils with short ranges.

So, the beetle - like fossil (Option A) is the best index fossil as it is present in both outcrops, indicating a short geological range and wide distribution.

Answer:

A. Beetle