Life is responsible for creating the oxygen in our atmosphere.
a. true
b. false

If life means the growth of living plants such as cyanobacteria or blue-green algae, then it is true that life is the one responsible for the production of oxygen by photosynthesis. Through the use of the abudance of sunlight, water and carbon dioxide, oxygen can be produced. Until now, with the help of the plant's symbiotic cyanobacteria and the process of photosynthesis, oxygen is still present.

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.