An organism has two different possible traits, a and b. a graph of the population is shown right. which of the following statements is true about trait b? check all that apply.

it decreased in frequency over time.

it became extinct.

it is carried on a recessive allele.

Trait B is gradually decreasing over time mainly due to natural selection and natural selection can cause microevolution (change in allele frequencies), with alleles which are most suitable for environment to become more common in the population and if it continues to happen alleles not suited to the environment with respect to survival and reproduction can become extinct.

It is true that recessive trait is less common than dominant trait but if a trait is decreasing over time it does not necessarily means that it is due to its recessive allele because it could be possible that a recessive trait is more suited to the environment, so it will continue to survive and increase.

Natural selection is a mechanism of evolution, it's the only one that can consistently make populations adapted, or better-suited for their environment, over time.

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 !