Which biome has been most impacted by logging?
a. tundra
b. taiga
c. grassland
d. temperate rain forest

Temperate rain forest is the most affected or impacted by logging. Logging is an activity of human that cut trees on the forest and not planting another one again. Logging can cause deforestation especially those people who perform illegal logging. 

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.