Which element has an ion that is smaller than an ion of calcium?

Explain why scientists use shared characteristics to make cladograms.

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

What is a number added in front of a formula in order to balance the equation