Catfish are freshwater fish that have "whiskers" with taste buds, as well as a keen sense of smell for locating prey in murky water. Catfish are best adapted for life in the ecosystem.

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.

The littoral zone. . .

Scans the skeleton into a facial reconstruction software.