A type of trilobite is used as an index fossil. These fossils were made around 540 million years ago. A scientist finds a trilobite fossil within layer 3 in the diagram (picture).

What can the scientist conclude from this finding?

A. Fossils from layer 9 are the newest in the diagram.

B. All the fossils in this diagram are at least 540 million years old.

C. Layer 1 has the newest fossils in the diagram.

D. Fossils in layer 5 are less than 540 million years old.

What is used to keep track of the gamates and possible offsprings combination

Two critical interventions to turn around the opioid crises are:

Use this dichotomous key for insect identification to identify the insect shown. 1. a. insect has one pair of wings. order diptera b. insect has two pairs of wings. go to #2 2. a. front wings thicker in texture than hind wings go to #3. b. front and hind wings are same texture throughout. go to #4 3. a. front wings are short order dermaptera b. front wings cover entire abdomen order coleoptera 4. a. wings with scale on all parts of their area. order lepidoptera b. wings without scales go to #5. 5. a. hind wings smaller than front wings. order ephemeroptera b. front and hind wings nearly equal in size. order odonata the insect pictured is in the order diptera. ephemeroptera. coleoptera. odonata.