What should have been a control in Redi's experiment?
OA) the flies
OB) the jar covers
OC) the amount of meat in each jar
OD) the number of maggots on the meat

Idon't really understand this can you me and show your work.☺☺[ chemistry b] subject [ electron transfer in lonic bonds]grade( 12)

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

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?