According to the biological species concept, individuals belong to the same species if they can interbreed in nature and produce viable, fertile offspring. Prezygotic and postzygotic barriers ensure that members of different species do not reproduce with one another. Match the following examples to the specific barriers at work.Two fish species spawn at different depths. Offspring of two newts are sterile. Lion-tigers don't reach maturity. Birds are active at different times of day. Flowers accommodate different insect pollinators Beetle mating display shows different spot patterns.

The examples can be matched to the specific barriers as follows:

1. Two fish species spawn at different depths: This is an example of a habitat isolation prezygotic barrier. The two species are isolated from each other because they spawn at different depths and therefore do not come into contact with each other to mate.

2. Offspring of two newts are sterile: This is an example of a postzygotic barrier known as hybrid sterility. The two newts can mate and produce offspring, but the offspring are sterile and cannot reproduce.

3. Lion-tigers don't reach maturity: This is an example of a postzygotic barrier known as hybrid inviability. The offspring (lion-tigers) do not survive to reproductive maturity.

4. Birds are active at different times of day: This is an example of a temporal isolation prezygotic barrier. The two bird species are active at different times of the day, so they do not come into contact with each other to mate.

5. Flowers accommodate different insect pollinators: This is an example of a mechanical isolation prezygotic barrier. The flowers are adapted to be pollinated by specific insects, so they cannot be pollinated by other species.

6. Beetle mating display shows different spot patterns: This is an example of a behavioral isolation prezygotic barrier. The beetles are attracted to specific spot patterns for mating, so they do not mate with beetles that have different spot patterns.