“There can’t be any question about what they meant. Remember, this is a zoology class. Evolution is taught.”
The association with “mainstream science” is often weaponized as a way of overawing us and persuading us to stop expecting answers to hard questions.
Evolution is all, or almost all, evolution by destruction. Michael Behe gives the analogy of a bridge separating you from an invading group of enemies.
Wesley Smith commented earlier on the struggle, via litigation by the Nonhuman Rights Project (NRP), to grant human-like “rights” to an elephant in the Bronx Zoo.
“The case that human language develops step by step through natural selection is weakened by the fact that no single language gene has ever been discovered.”