What does it mean to say that one species facilitates another species?

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

Sickle cell amelia is a condition condition where the red blood cells are deformed which is affected by sickle cell amenia

For each of the formulas, classify the formula as either an empirical formula, a molecular formula, or both. nahco3 empirical molecular both