Viruses did not evolve first, they found. Instead, viruses and bacteria both descended from an ancient cellular life form.
Permafrost layer in Tundra is the layer of earth beneath the topsoil that remains frozen during the year and is usually only a few feet beneath the surface. It prevents trees from growing in the tundra because trees need to have deeper roots plus they cannot grow in the frozen ground.
Biome plants are : shrubs, sedges, mosses, lichens, grasses, and some flowering or herbaceous plants.
D. Enzymes increase the rate of the chemical reactions carried out during metabolism.
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There is less and less sunligt. It gets darker and harder to see.
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