Ecosystems are constantly (changing, remain the same) in the (same, different) ways over time.

Need on both questionswill markbr />

Based on its chemical properties, identify the position of each chemical family on the periodic table.

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.