A sample of rock is found to contain 100 grams of a parent isotope. How many grams of the parent isotope will remain after one half-life? 100
75
50
25

Select each correct answer. more than one answer may be correct. which of the following is a characteristic of unicellular organisms? they can possess tissues and organs. all of their functions are performed by a single cell. they are usually microscopic. each of their cells is specialized to perform a specific function.

The semi-conductors on the periodic table are classified as

Chortling is used to clean water. another possible atom that would also work is a. sodium b. sulfur c. bromine