Question

can you answer these
Marsupials, such as kangaroos, koalas, and wombats, are mammals that care for their newborn young in a pouch. All marsupials that are found in Australia are thought to have evolved from a single species that migrated to the island and then adapted to the various niches. What does this example illustrate?
behavioral adaptation
adaptive radiation
geographic isolation
population explosion

Which of the following must occur for speciation to happen?
geographic isolation
reproductive isolation
temporal isolation
behavioral isolation

Which of the following is the best definition of biogeographic isolation?
the separation of members of a species through geographical or biological forces
the separation of members of different species through geographical forces
the separation of populations of different species through time
the separation of members of a species through anatomical forces

Which is most likely to happen to a population that becomes anatomically isolated from the rest of its species?
The entire species will become extinct.
The population will become a separate species over time.
The population will breed with a different species nearby.
The entire species will continue to have viable offspring together.

Gentoo penguins present a potential mate with a pebble. Emperor penguins have a specific call and movement that they make to attract a mate. Which type of isolation do these penguins demonstrate?
temporal isolation
behavioral isolation
geographical isolation
anatomical isolation

Answer 1

1) Adaptive radiation — one ancestral species diversified to fill many ecological niches in Australia.

2) Reproductive isolation — speciation requires barriers to gene flow so populations stop interbreeding.

3) The separation of members of a species through geographical or biological forces — this best matches biogeographic isolation.

4) The population will become a separate species over time — isolation promotes divergence that can lead to speciation.

5) Behavioral isolation — courtship displays (pebble offering, calls/movements) are behavioral mating barriers.