Which equation correctly describes the relationship between the measures of the angle and arcs formed by the intersecting secants? m∠1=12(mPQ−mRS) m∠1=12(mPQ+mRS) m∠1=mPQ−mRS m∠1=12mRS Circle with two chords. Point P at 1 o clock, point Q at 5 o clock, point S at 8 o clock, and point R at 9 o clock are on the circle. Segment P R and segment Q S intersect each other outside the circle. The angle made at the intersection point is labeled as 1.

1. 8

2. 9

3. 20

4. 3

5. 17

6. 2.2

7. 11.25

8. 1

9. 14

10. 2

step-by-step explanation:

thats the first half

the answer is; biodiversity resulting from few ancestors

adaptive radiation occurs when a population is subjected to a large natural environment with spatial ecological variations. the parts of the population in the different ecologies begin to adapt to their local environments. due to non-random mating across the large populations, this causes the different populations from the large population to speciate within their local environments. they, therefore, diverge to different species sharing a common ancestor.