This could be two answers Water or Oxygen. I would go with water because it contains oxygen therefore making it a possible answer. Hope I helped. :)
The correct answer is (a.) Its spindle-shaped cells allow it to do smooth muscles. The structure of the cardiac muscles which is spindle-shaped is very important for the heart to withstand the stretching of the muscles during the contractions. Also for its smooth surface which is very important to prevent any possible blood clot during circulation.
Answer:
The cone releases the seeds, and they float in the wind until they reach the ground where they can germinate and grow. Some do not produce seeds, instead they use spores to reproduce.
Ex. of Spore producing plants include: mosses and ferns
Condensing point of the substance