Over Earth's history a number of supercontinents are thought to have existed. The most recent and well understood is the supercontinent known as Pangaea, which formed approximately 335 million years ago and began to break up into the continents we know today, from about 175 million years ago.
It's important to understand that the Earth's crust and it's land masses are in constant flux over geological time. Tectonic plates are shifting continuously and over millions of years this causes land masses to collide and split apart. The way we see the land mass (countries and continents) distributed on a world map today is simply a snap shot in Earth's history. It was a vastly different picture 100 million years ago and will be a vastly different picture in 100 million years. The Himilayan mountain range in Asia is growing today at a rate of about 1cm per year as the Indian and Eurasian tectonic plates continue to collide and thrust up crust material to produce the mountains.
The evidence to support the supercontinent theory is not just in tectonic plate theory, it's in the relationships between life on and between different continents. When land masses split and separated populations of plants and animals, they evolved differently to form new species. The intricacies of these inter-species relationships and genetic heritage can be used to track the nature of how the landmasses interacted over time.
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When two or more organisms have the same type of physical features in them, it shows that the organisms might have evolved from a common ancestor. Such structures are known as homologous structures.
For example, the forelimbs of humans, birds, whales and dogs have the same kind of structural anatomy. Although, their functions might be different but their structures are similar. This similarity depicts that the organisms might have a common ancestor in the past.
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>consist of fats, phospholipids, and steroids
>include cholesterol and saturated fats
Air also affects evaporation,If a air pressure is high on the surface of a body of water,then the water will not evaporate easily.The pressure pushing down on the water makes its difficult for water to escape into the atmosphere as vapor... Temperature,of course,affects how quickly evaporation happens.
I'm pretty sure that the cell membrane acts as the cell wall if you understand what I'm saying. The cell membrane will be the outermost structure.