What change (or transition) in habitat did whales' ancestors make?

Substances effect: partially blocks (h+)/pyruvate symporter, interfering with the transport of pyruvate into the mitochondria. will this make the body lose or gain weight?

Acladogram is a branching diagram that represents suggested evolutionary relationships among organisms based on the presence of unique traits. a scientist discovers a new organism that lacks limbs and does not have a true backbone. the organism lays eggs to produce offspring and has a cartilage-like rod known as a notochord running along its dorsal surface. on the cladogram below, select the species to which the newly discovered organism is most closely related.

Which best explains why there are 64 possible codons in the genetic code and only 20 amino acids that make protiens of living organisms on earth