What causes metamorphoic rocks to form from existing rocks

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.

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?

Give examples of selective advantage of organism’s body part/organ