Agreater amount of dna damage occurs when a living organism is exposed to a greater amount of a radioactive isotope. how might this affect the number of mutations acquired by the organism? a. more mutations will be acquired, leading to more phenotypic changes. b. the number of mutations will be the same because the same isotope was used. c. there will be no mutations because damaged dna is always repaired perfectly. d. fewer mutations will be acquired, leading to fewer phenotypic changes.

Option A, More mutations will be acquired, leading to more phenotypic changes

Explanation:

Radioactive material causes mutations in living organisms. Radioactivity is very harmful to living cells as it is ionizing in most of the cases which means it can remove an electron from an atom. When DNA in a human cell is exposed to radiation, its structure may get disrupted thereby causing loss of electrons and hence mutation. The mutated cell will not function like a normal cell and also the repair process of cell is slow. Therefore, once a cell is  mutated  it takes years to repair and there are high chances that it does not get repaired ever and is just carried to next generation.

These mutated cell will express certain distorted physical trait (phenotype). Thus, option A, is correct

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 !