Will mark Brainless you have a rock containing the element x which has a half life of 1000 year. no daughter product were originally present. however now there is an equal amount of element x and its daughter product. How old is the rock?? Anyone can help? Thank you guys!

on the planet jupiter, the acceleration due to gravity is approximately 26 m s2 , roughly 2.7 times the acceleration due

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

you should wear a lead protective shield when having teeth x-rays

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-lavira : )