Sample of radioactive element is it half-life of 3.0 days. It's 2.0 kg of the same several remains unchanged after 9.0 days, what was the initial mass of the sample question

What is the amount of organic matter in all living organisms in a habitat called?

Compare the quantity in column a with the quantity in column b. pa p a is tangent to the circle at a. column a column b ap a p ax a x question 4 options: the two quantities are equal. the quantity in column a is greater. the relationship cannot be determined from the information given. the quantity in column b is greater.

At which boundary does subduction stop occurring, resulting in a mountain range?