Explanation:
From the studies done on seismic elastic waves, it has been discovered that the innermost core of the earth is a solid concentric layer. Seismic P and S waves can be propagated through solids but the s-waves are cut off in contact with a liquid medium. This is because s-waves are shear waves and fluids do not shear.
- At the outer core, the s waves is cutoff and it reappears in the region of the inner core.
- This shows that the inner core is solid.
- The inner core is made up of iron and nickel with some other siderophiles.
- At the inner core, the pressure is very great. Pressure here is about 350gigapascal.
- This huge pressure compresses matter into solids despite the very high temperature.
- Also, during the differentiation of the earth, the heavier minerals moves downward to the core due to their density. Metals in the core have density of about 13g/cm³.
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6:1 Ratio means that it is easier to move the materials. SA = ^2, while V = ^3. That means volume increases at a faster rate than surface area. That is why is it optimal to have a high SA:V ratio, which is why cells are so small.
Answer:
Lungs and Endoskeleton.
Explanation:
Gills helps it live in water, and Scaly skin doesn't really apply
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