A parent isotope has a half life of 1 million years. If a rock contained 20 mg of the parent isotope when it formed, how much parent isotope would be left after 2 million years?

What does the ph scale measure

Use the periodic table to complete each nuclear fusion equation. 2 1 H + 3 1 H → A B He A: B: 14 7 N + 1 1 H → C D E C: D: E:

Write a 225 word report on why each of the factors (R, K, L, S, C, and P) are important factors needed to determine the amount of erosion that occurs on a piece of agricultural land.

Ability of an organism to survive and reproduce

Humans are subject to the same limiting factors as other populations. True or False?

Nature selects traits that make a species more successful in its environment. true or false

Which type of stem cell is described below? stem cells are available from a variety of sources, including blood from an umbilical cord, or cells in the placenta, the bone marrow, and even human fat.

What does elements do carbohydrates contain

How many cell divisions would it take to produce at least 1,000 cells from one cell? (When one cell splits in half during cell division, the result is two new cells. Each of those cells can divide into two more and so on.) Answer (256?)

IBS is caused by a reaction to proteins in foods