The answer is; B
The carbon cycle exists in the atmosphere mainly as carbon dioxide. The levels of carbon dioxide change can change dramatically over years. The movement in and out of carbon in the atmosphere is fast and influences by factors such as combustion and photosynthesis. The former increases carbon in the atmosphere whole the latter decreases it.
As the oceans simultaneously warm, acidify and increase in PCO2<span>, prospects for marine biota are of concern. Calcifying species may find it difficult to produce their skeleton because ocean acidification decreases calcium carbonate saturation and accompanying hypercapnia suppresses metabolism. However, this may be buffered by enhanced growth and metabolism due to warming.</span>
D. a protective membrane, because they surround<span> the cell
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<span>Crime Scene Reconstruction
</span>Crime Scene Reconstruction is the method used to support a likely sequence of events at a crime scene by the observation and evaluation of physical evidence and statements made by individuals involved with the incident
<span>NOT:
</span>Confession
Circumstantial evidence
<span>Direct Evidence</span>