In the carbon cycle, what form of carbon do producers take in from the atmosphere to perform photosynthesis?

Producers like plants take in carbon dioxide (CO2) from the air to perform photosynthesis

Six amino acids have side chains that are polar but not charged. these are serine (ser), threonine (thr), cysteine (cys), asparagine (asn), glutamine (gln), and tyrosine (tyr). these amino acids are usually found at the surface of proteins, as discussed in the proteins 2 module.