<span>International System of Units (SI Units) are organized body of measurements for physical quantity. They are set to be the norm or global norm scaling for every physical quantity which includes kilogram, meter, second, ampere, kelvin, candela and mole. These measurements then can increase or decrease by the power of ten, multiplied or divided. As said and explained, the SI is helpful in describing objects because </span>
<span><span>1. </span>They give us the idea of how much matter is contained in that single substance or the current state the matter is in or how hot or cold. We measure and can quantify the quality of the specific matter.</span> <span><span>
2. </span>SI Units are a global set of measurement hence, we can communicate with ease from western to eastern countries with these measurements without having problems in terms of portraying or displaying a set of physical quantities.</span><span>
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This feathered dinosaur is not considered an index fossil because it existed too long ago, and Index fossil are organic remains of animals and plants found in the strata of sedimentary rocks, and serve to date their ages. This is done through the so-called index fossils, so called because they only existed in a certain era or geological period.
Physical characteristic was present in a common ancestor, species may have similar physical characteristics (homologous structures).
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What are homologous structures?</h3>
A physical trait that distinguishes two or more species, such as a complicated bone structure or a body plan, may have been passed down from a common ancestor.
A common ancestor's evolutionary history causes physical characteristics to be homologous.
Sometimes, structures in an organism are similar to crucial structures in other animals, but they no longer serve the primary ancestral role. Vestigial structures are these structures, which are frequently scaled down.
Therefore, Physical characteristic was present in a common ancestor, species may have similar physical characteristics (homologous structures).
To learn more about homologous organs , refer to the link:
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