Which characteristic of potassium makes it useful for dating rocks? It has a long half-life. It decays at an unknown rate. It produces lead as it breaks down. It can be used to date all types of rock.

It has a long half-life.

Explanation:

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

you can have just about every answer you can think of