The heart is a hollow, -shaped, muscular pump within the cavity. The average adult heart is cm long and cm wide. The heart lies in the under the sternum

1.cone shaped

2.Thoraxic cavity

3.14cm long

4.9cm wide

5.Mediastinum

Explanation:

Heart is located in the thoraxic cavity just between the lungs. It has a cone shape about 14cm long,9cm wide an about 6cm thickness. A female heart is about 250-300gram and a male heart is 300-350gram,the heart has 4 chamber, 2 chamber above and 2 chamber below its include the auricle and ventricle. The hearts is responsible for circulation of blood and nutrients round the body system.

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 !

the correct option is option d