Which of the following is considered to be a living organism?
a. egg cell
b. human heart
c. grass
d. atmosphere

C. grass

Explanation:

A living organism can be define as an organism which is capable of responding to the external stimuli, growth, reproduction and development during it's life span.

Among the options given, grass is the correct option, this is because of the fact that grass describes to be a complete organism. But the egg cell, human heart are the parts of the living beings. The atmosphere is the part of earth which includes the mass of gases called as air. It is not a living organism.

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 !