When two plant species cross-pollinate, the resulting seeds fail to develop into mature plants. Geographic Isolation Behavioral Isolation Reproductive Isolation Temporal Isolation Two similar species of songbirds have different courtship songs and don't recognize each other as potential mates. Geographic Isolation Behavioral Isolation Reproductive Isolation Temporal Isolation

## Step 1<br />The first scenario describes a situation where two plant species cross-pollinate, but the resulting seeds fail to develop into mature plants. This is an example of reproductive isolation. Reproductive isolation is a mechanism that prevents species from interbreeding with others. In this case, even though the plants are able to cross-pollinate, the resulting seeds do not develop into mature plants, indicating that there is a barrier preventing successful reproduction.<br /><br />## Step 2<br />The second scenario involves two similar species of songbirds that have different courtship songs and do not recognize each other as potential mates. This is an example of behavioral isolation. Behavioral isolation is a type of reproductive isolation that prevents species from interbreeding due to differences in their mating behaviors. In this case, the songbirds have different courtship songs, which means they do not recognize each other as potential mates, preventing them from interbreeding.