In an alternate dimension, Promethium (Pm; Z = 61) is stable. It has 3 stable isotopes 145pm (144.96 amu; 68.47%), 146Pm (145.98 amu; 21.39%), and 147Pm (146.99
amu; 10.14%). What is the average atomic mass of Promethium in this alternate
universe?

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.

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a. the mitochondria b. the nucleus c. the vacuoles d. the endoplasmic reticulum

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?