I want to say it was erotion from water
The best and most correct answer among the choices provided by your question is the first choice or letter A.
Metamorphic rocks <span>found at a convergent boundary and a divergent boundary will help form the both the igneous and the sedimentary rocks.</span>
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Answer: B. Water breaks down into oxygen molecules for respiration.
Water is the required for photosynthesis, a process by which plants (terrestrial and aquatic) makes their food by utilizing water as a reactant to produce oxygen and glucose as product. The glucose act as a source of energy for conducting various metabolic processes in plants but oxygen is released in the air.

This oxygen is necessary for terrestrial and aquatic animals for respiration. Therefore, water breaks down into oxygen by the process of photosynthesis, hence water plays important role in respiration in living beings.
Like smooth muscles, cardiac muscles can remain in contraction for a sustained period.