Please help me find the complementary strand for this

Asnail, elodea (aquatic plant), or both were added to the tubes and they were stoppered. tubes were placed under a grow light for 24 hours and the results recorded. the test tubes were then covered for 24 hours to produce a dark environment and the results recorded. which statement best explains the change in test tube d from the light setup to the dark setup.

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

What type of competition exsist between two species. turtles and fish