Biology, 26.06.2019 18:00 KingMack1136

The heart is a muscular organ that pumps blood. blood that contains waste materials is brought to the heart by blood vessels. this blood enters the 1 and then moves down. the presence of the 2prevets the backflow of blood inside the heart 1. right atrium left atrium right ventricle 2. atrioventricular valve valves in the aorta valves in the veins

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Answer from: jennkoga

Answer:

The blood enters the right artrium.The Presence of valves prevents backflow of blood.

Explanation:

The heart is a muscular organ, blood enters the heart through two large veins that is superior and inferior vena cava. Valves opens and close tightly, as heart pumps the blood, the valves prevent the blood to stop flowing in the backward direction. There are two main valves which is tricuspid valve and bicuspid valve. It helps in preventing back flow. The tricuspid valve is present in between right atrium and ventricle. The biscuspid valve is present in between left ventricle and left atrium.

Answer from: Quest

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 !

Answer from: Quest

This movement is also referred to as glacial plucking

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