Question

rotation 6
adaptive radiation occurs
when a species is introduced
to a new environment, and
changes in phenotype occur
as a result. the illustration
below represents species that
exhibits (shows) that adaptive
radiation has occurred.

what environmental factor resulted in
these birds evolving differently that
the original species “a”?

Explanation:

The problem is about adaptive radiation in birds (like Darwin's finches - though here it's a similar bird example). The key is to identify the environmental factor driving their different evolution. The birds have different beak shapes for different food sources (nectar, insects, seeds, etc.). So the environmental factor is the availability of different food sources (or ecological niches) in their habitat. When the original species entered a new environment with varied food types, natural selection favored different beak adaptations for exploiting those foods, leading to adaptive radiation.

Answer:

The environmental factor is the availability of different food sources (ecological niches) in the environment. The original bird species faced a new environment with varied food types (nectar, insects, seeds, etc.). Natural selection acted on beak - related traits: birds with beaks suited to a particular food source (e.g., long thin beaks for nectar, strong beaks for seeds) survived and reproduced more, leading to the evolution of different species from the original one, which is adaptive radiation.