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The seafloor is only 180 million years old due to the process of subduction. The floor of the sea's tends to get colder and denser with the passage of time. At a certain time, the seafloor becomes so dense that it sinks in the upper mantle. The Earth's crust cannot undergo this process and hence has oldest rocks. We can say that the seafloor is less than 180 million years old because it is typically recycled back into the mantle of the Earth.
One requirement for natural selection would be the variation or differences of heritable traits being observed in a select group of organisms, allowing for better adaptability and ultimately survival of the said group or category of organisms.
Explanation; -A water molecule can act as an acid or a base even in a sample of pure water. It acts as an acid (donates H+) when it reacts with a stronger base, say sodium hydroxide.
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The reason why it occurs is when the organism doesn't have the desirable traits it needs to survive.
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Answer: good night sleep tight bye
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