Option D is correct.
A synapse is the opening between neurons that neurotransmitters pass through.
I think the respiratory system and circulatory system
The most prominent example of carbon fixation is photosynthesis
The drugs that are found are <span>Tar, </span><span>Carbon monoxide,</span><span> Nicotine and</span><span>Emphysema </span>
Answer:
Humans have greatly increased the level of in the atmosphere. O A. argon B. oxygen O . C. carbon dioxide O D. nitrogen
=carbon dioxides
