Question

12 multiple choice 6.25 points geographic isolation caused the separation of rainforest frog populations into a population in the north and a population in the south. the separated populations later reconnected because the climate became wetter and warmer, causing the rainforest to expand. when males from the north mated with females from the south, the offspring failed to develop past the tadpole stage. when males from the south mated with females from the north, the offspring developed more slowly than the offspring of pairs of northern frogs. based on these data, which event occurred while the two populations of frogs were separated? the two populations had fewer offspring than before the separation. the two populations mated with other species of frogs. the two populations began a new method of reproduction. the two populations developed into new species. 13 multiple choice 6.25 points the fossil record suggests that species currently living on earth may have evolved from extinct species. are not related to any extinct species. have stopped evolving. are becoming less diverse.

Explanation:

For question 12: Geographic isolation can lead to speciation. When the two frog populations were separated, genetic changes could occur independently. The fact that their offspring have issues (either not developing past tadpole stage or developing slowly) indicates reproductive isolation, a key aspect of speciation. There is no information about fewer offspring (no data on pre - separation offspring numbers), no mention of mating with other species, and no indication of a new reproduction method.
For question 13: The fossil record shows a progression of life forms. Many current species have similar anatomical or genetic features to extinct species, suggesting an evolutionary link. There is evidence against the idea that current species are not related to extinct ones (fossil similarities). Species are still evolving (e.g., bacteria evolving resistance), and the fossil record and current biodiversity studies show that diversity has generally increased over time.

Answer:

1. The two populations developed into new species.
2. may have evolved from extinct species.