Adog breeder wishes to develop a breed that does not bark. she starts with a diverse mixture of dogs. generation after generation, she allows only the quietest dogs to breed. after 30 years of work she has a new breed of dog with interesting traits, but on average, the dogs still bark at about the same rate as other dog breeds. which of the following would be a logical explanation for her failure?
a. there is no variation for the trait (barking).
b. the tendency to bark is not a heritable trait.
c. the selection was artificial, not natural, so it did not produce evolutionary change.
d. there was no selection (differential reproductive success) related to barking behavior.

Option B

Explanation: There are basically two types of traits. Acquired and inherited traits.

Acquired traits: The traits that is acquired from the environment and cannot be inherited from one generation to another generation is known as acquired trait.

Such as time of barking, time of sleeping, amount of food that one animal eats.

Inherited traits: The traits that can be transferred from one generation to another generation is known as Inherited traits.

Example: fur color, height, eye color.

So, the condition here is rate of barking which is not a heritable trait and cannot transferred from one generation to another even by breeding for several generations(option B ).

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 !