Fossils<span> provide solid </span>evidence<span> that organisms from the past are not the same as those found today; they show a progression of </span>evolution<span>. </span>Scientists<span> calculate the age of </span>fossils<span> and categorize them to determine when the organisms lived relative to each other.
Hope this helps :)</span>
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Half of the Moon's surface is always illuminated by direct sunlight, except during lunar eclipses when Earth casts its shadow on the Moon. Just how much of that light we can see from Earth varies every day, and we refer to this as a Moon phase.
Orbits: Earth
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All of them are mostly true but I would say option 2 :)
Mammalian red blood cells contain hemoglobin as its primary unit for oxygen and carbon dioxide transportation. In order to increase the efficiency of transport (increase the amount of oxygen and carbon dioxide transported per red blood cell), the red blood cells' structure are designed to be biconcave. This efficient structure of the red blood cells increases it function compared to a spherical red blood cell (low surface area, i.e. hereditary spherocytosis). <span>This is an example of the relationship between structure and function of the red blood cells. </span>Also, the biconcave shape of the red blood cell makes it more resilient to early destruction in the small capillaries and the spleen (since the spleen is mostly responsible for red blood cell turnover, which is every 120 days).
