You really should take a hard look at whatever “lesson” you got in college and actually read what evolution means from some current evolutionary biology papers. It doesn’t only refer to speciation. Obviously speciation can happen as a gradual process without a clear start and end date as two populations slowly diverge. That process is called…evolution.

JFC. You are a science teacher? Where? Do you deny the fact of Darwinian evolution?

It’s not JUST a change in color. You’re acting like the frogs got a sun tan. What is changing over successive generations is the frequency of genes in the population that code for more melanin. The population is changing. The gene frequencies are changing. The offspring are very slightly different than their ancestors, on average. That’s evolution, baby. The author of the study has a PhD in biology.

Selection is the pressure. Evolution is the result. You have a bad understanding of the terms and hopefully are not passing this bad understanding to your pupils. Read what people with PhDs in evolutionary biology have to say on the matter.

What’s an example of evolution based on your understanding?

I would love for you to explain what you think evolution is, if it’s not this.

Evolution is the change in heritable characteristics over generations. That is what’s being documented here. It’s micro evolution, but it’s evolution. Selection is ONE pressure causing evolution. The selection is the increased radiation environment around Chernobyl that favors individuals with more melanin. But the higher proportion of individuals with increased melanin in the population over time? That’s evolution bruh.

You need to look up the definition of evolution bruh

Yup. Frogs are easy to find by sound. Not so easy by sight.