11. Plants, like trees, require special tissues to maintain their rigidity so they can grow upwards and branch out. Which of the following cell structures is most important in maintaining the rigidity of plants? * A. 
Cell wall
* B. 
Cytoplasm
* C. 
Chloroplasts
* D. 
Cell membrane

According the inverse square law, doubling the distance from the source of the sound, a speaker, for example, will drop the sound 6 db each time. if you were standing in the back of an auditorium, 32 feet away from a speaker not using any amplification, would you be able to hear a speaker clearly? why or why not?

Nh3 +02-no + h20 is unbalanced what is the balanced equation

Chloroplasts and bacteria are in size. a. similar b. at different ends of the size range c. exactly the same d. none of these