*Earth Science* How many atoms of a radioactive parent element would be left in a rock that is 2 million years old if the half-life of the parent is 2 million years and the original amount of the parent is 32 atoms? a. 4
b. 16
c. 32
d. 8

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Hlo Good Morning

Radiometric dating uses known rates of radioactive decay to determine the age of a rock sample. 2. After 1 million years, there would be (1/2) (20 mg) 10 mg of parent isotope remaining. After 2 million years, (1/2) (1/2) (20 mg) 5 mg of parent isotope would remain.

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d

hello

answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this