How are infectious agents transmitted?

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.

What are the doorways into and out of cells, attached to the membrane, and built in the rough er.

Which statement correctly describes a way that mutations increase the likelihood that a species will survive in a changing environment