Based on how they each acted to the trials, witch substance (s)would most likely be metallic

The answer should be Cand them unit test sure do suck no cap :,)

Explanation:

a. possible errors

d. new questions

explanation:

predictions and planning happen before. a summery comes after. errors you get after investigation and new questions propose what you can look for in the future.

answer; ///(b) it is composed of four protein chains and four heme groups;