1. adaptive radiation in island chains (finches; honeycreepers)
2. exploiting a new niche in a common location
3. extrinsic factor prevents two or more groups from mating with
each other regularly
4. gene flow has been reduced between flies that feed on
different food varieties, even though they both live in the same
geographic area.
5. genetic polymorphism results in reproductive isolation
6. population isolated from another due to geographic barrier
7. populations remain in same physical area.
8. the gradual formation of the grand canyon split a population
into 2 divergent species.

d concave shape of wave rock

explanation:

the concave shape of wave rock is a very good evidence that supports the evolution of earth due to chemical weathering. if we talk about structure of   wave rock, studies have estimated that it is around 2.7 billion years old. it also serves as the foundation of evidence that it was the place where australian continent began to form.

how the structure of wave rock was created?

studies suggest that structure of wave rock was created when the surrounded area was started to weather due to which deposition of material started on the part of land which now contains wave rock.

the structure of wave rock is considered to be one of the best-known landforms in australia. at the height of around 15 cm, there can be found flared slopes which formulate the margins of hyden rock. it is now assumed by geologists that wave rock was created by subsurface water-induced weathering and not by glaciers, waves or wind.

due to deposition of material over the period of long time, the wave rock became tougher and tougher due to weathering from surrounding terrain. this makes it a physical evidence that supports   the evolution of earth due to chemical weathering.

hope it !

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.

whats the drop down answers ?

explanation: