Describe an organism that might live in an extreme environment like inside a volcano or deep in an ocean or in an icy cave. What special structures would it have in order to survive the environment?

Ascience research group is testing a new type of plant food. one trial is conducted in a controlled experiment. the data from the trial show that the plant that received the new food grew faster than the control plant. the group announces that the new plant food makes plants grow faster. what is the main weakness in this scientific claim?