Which pair of kingdoms include organisms which are all multicellular? a. animalia and fungi b. animalia and plantae c. protista and fungi d. protista and plantae

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?