Anew multicellular organism has been discovered, and scientists want to study the organism’s cell structures, including organelles. which microscope should they use? . a. scanning electron microscope. b. transmission electron microscope. c. compound light microscope. d. simple microscope

The microscope they should use is the transmission electron microscope. 
The transmission electron microscope is a type of microscope that has an electron gun, which produces the electron beam, and the condenser system, which focuses the beam onto the object, the image producing system , consisting of the objective lens, movable specimen stage, and intermediate and projector lenses; the image recording system, which converts the electron image into some form perceptible to the human eye. It is used to observe the features of very small specimens. 

What have scientists learned about plant behavior by studying the dodder plant