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.

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the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.

"it built up in the atmosphere"

i think thats it, idk, i tried looking for this exact q& a for grad. and idk if i got this question right or sorry if im wrong