Which statement explains what geologists can learn from the graph?
a. they can estimate that all the potassium will have decayed within 6.5 billion years.
b. they can tell that 1/8 of the argon gas will be left after 3.9 billion years.
c. they can determine that a rock is 1.3 billion years old if 1/2 of the potassium has decayed.
d. they can see that potassium’s half-life varies from every 1.3 billion years to every 5.2 billion years.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

i hope this

maritime tropical may be your answer.

the food storage products of chrysophytes are oils or the polysaccharide laminarin.   formerly classified as plants, the chrysophytes contain the photosynthetic pigments chlorophyll a and c all but the yellow-green algae also contain the carotenoid pigment fucoxanthin.