In C4 plants to avoid photorespiration, they have evolved CO2 concentrating mechanisms. These plants tend to be found in drier environments with high sunlight levels.
Will increasing CO2 levels in the atmosphere reduce the advantage of C4 versus C3 plants in these environments? Justify.

Yes

Explanation:

In hot regions, with intense sunlight where stomata closes during the day, C3 plants photorespiration drains away as much as the 50% of the carbon fixed by the Calvin cycle for photosynthesis. C4 plants have evlove to minimize photorespiration and increase photosynthesis.

As CO2 levels are increased C3 photo-respiration decreases. More CO2 increases the photosynthetic rate of C3 plants. The increasing photosynthetic yield of C3 plants at higher levels of atmospheric CO2 makes C3 plants as better as C4 plants. In addition less ATP is used in C3 plants when compared to the energy cost of C4 photosynthesis

it has one origin of replication, but it proceeds in two directions - d)

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 !