Question

select all of the following scenarios in which speciation is likely to occur.
correct answer(s)
development of a farm bisects a swamp into two distinct swamps.
a dam is built, blocking a stream that connects two lakes.
a predatory frog in a small stream becomes extinct.
a freshwater lake warms by two degrees.

Explanation:

Speciation occurs when populations are isolated (geographical or reproductive) and diverge.

• "Development of a farm bisects a swamp into two distinct swamps": Geographical isolation of swamp populations, so speciation likely.
• "A dam is built, blocking a stream that connects two lakes": Isolates lake populations, promoting speciation.
• "A predatory frog in a small stream becomes extinct": Removes a predator, not isolation/divergence for speciation.
• "A freshwater lake warms by two degrees": Environmental change, but no isolation; less likely for speciation.

So the scenarios with likely speciation are the ones with geographical isolation (farm bisecting swamp, dam blocking stream).

Answer:

• Development of a farm bisects a swamp into two distinct swamps.
• A dam is built, blocking a stream that connects two lakes.