francesco redi conducted the following experiment.

jars of meat with covers did not have maggots.

jars of meat with no covers did have maggots.

what should have been a control in redi's experiment?
a. the flies
b. the jar covers
c. the amount of meat in each jar
d. the number of maggots on the meat

d

Explanation:the reason i pick d is because it say jars of meat with covers did not have maggots.Jars of meat with no covers did have maggots

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.