After three half-lives, a sample contains 10 grams of parent isotopes. how many grams of the parent isotope were present to start?

The answer is actually (80). 80/2 is 40, 40/2 is 20, and 20/2 is 10, thus the answer is 80.

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

hello everyone my name is nevaeh, i know everyone needs in some way, shape, or form and i am willing to provide. i set up a google classroom where people can ask me questions and get on work. no question is a stupid question so do not be afraid to ask. i usually only focus on core subjects but if you ask i will with other specialized subjects. i can do essays all the way to power points : )

my google classroom is the code is 7hr2k4

~ use this opportunity to get more so you can thrive in the classroom

the answer is a) a shiprock was formed by igneous process