How are cyanobacteria related to increases in oxygen in the atmosphere

Numbers with a end value of 4 or lower are rounded up, while with an end value of 5 or higher are rounded down. true or false?

How many molecules are found in 1.32 mol of nacl?

Choose all the answers that apply. ionic compounds dissolve easily in water do not dissolve in water have low melting points have high melting points conduct electricity when melted