Allopatric speciation is said to occur when two groups of organisms are separated by a physical or geographical barrier. Examples of such barriers are ocean, mountain range, rivers, etc. A good example of allopatric speciation is Galapagos finch. Different species of this bird can be found in different islands at Galapos, which is located at Pacific Ocean off South America. The ocean is barrier that isolate the species from one another.
Cells in the sponge<span> walls filter food from the </span>water<span> as the </span>water<span> is pumped through the body and the osculum ("little mouth").
The flow of </span>water<span> through the </span>sponge<span> is in one direction only, driven by the beating of flagella which line the surface of chambers connected by a series of canals.</span>
i would say b! if im wrong im sorry...
More drought and flooding, less ice and snow, rising sea levels
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Two signs you can observe are physical changes such as burnt paper to ashes, and you can see in what form it is in, such as liquid,gas or solid.
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