Apolarized neuron in its resting state has a a. high potassium ion concentration on the outside of the cell membrane and a high sodium ion concentration on the inside of the cell membrane. b. high potassium ion concentration on the inside of the cell membrane and a high sodium ion concentration on the outside of the cell membrane. c. high potassium and high sodium ion concentration inside the cell membrane. d. high potassium and high sodium ion concentration outside the cell membrane.

B. high potassium ion concentration on the inside of the cell membrane and a high sodium ion concentration on the outside of the cell membrane.

Explanation:

Every response of a human to any situation occurs due to the working of network of neurons which take the stimulus from environment move it to brain and then produce a specific response.

The neuron normally stays in a polarized state when there is no external stimuli and it do not has to produce any response. In this case the membrane potential is –70 mV and there is a high potassium ion concentration on the inside of the cell membrane and a high sodium ion concentration on the outside of the cell membrane (please see figure). But when a stimulus of specific threshold greater than the resting potential is acheived, the situation reverses. Na+ channels open in the membranes and Na+ quickly start moving inside the membrane while K+ starts coming outside of the membrane This is called Depolarization which is later followed by subsequent events of  Repolarization  and Hyperpolarization .

Therefore, Option B is correct option.

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 !