An arch is a vertical curved structure that spans an elevated space and may or may not support the weight above it, or in case of a horizontal arch like an arch dam, the hydrostatic pressure against it.
The many forms of arch are classified into three categories: circular, pointed, and parabolic. Arches can also be configured to produce vaults and arcades.
<h3>Rounded/circular</h3>
Rounded/circular arches were commonly used for ancient arches that were constructed of heavy masonry. Ancient Roman builders relied heavily on the rounded arch to span great lengths.
<h3>The parabolic</h3>
The parabolic arch employs the principle that when weight is uniformly applied to an arch, the internal compression resulting from that weight will follow a parabolic profile. Of all forms of arch, the parabolic arch produces the most thrust at the base yet can span the greatest distances.
Therefore, the parabolic arch is more structurally sound.
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Answer:
Now the terms provided are required to be explained as according to the standard given OCR (oxford, Cambridge , and RSA examination). So for that we have the following definitions as given below:
Explanation:
<u>Cell-</u> A cell is the basic unit of life and all organisms are composed of one or more cells. There are two
fundamental types of cell: prokaryotic and eukaryotic.
<u>Exchange-</u> The gas exchange system is responsible for the uptake of oxygen into the blood and the excretion of carbon dioxide. Now exchange in organism mostly occur in gaseous form.
<u>Transport- </u>They occur in Both plants and animals so,
<u>Transport in an Animal body -</u>As animals become larger, more complex and more active, transport systems become essential to supply nutrients to, and remove waste from, individual cells.
<u>Transport in Plants body-</u> Transport systems in plants move substances from where they are absorbed or produced to where they are stored or used.
Plants do not have systems for transporting oxygen and carbon dioxide; instead these gases diffuse
through air spaces within stems, roots and leaves.
F-stop determines highlights.
