Periods of the Paleozoic Era. There are six periods in the Paleozoic Era: Cambrian, Ordovician, Silurian, Devonian, Carboniferous (alternatively subdivided into the Mississippian Period and the Pennsylvanian Period), and the Permian.
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Deforestation because without trees and plants, they are nothing to convert CO2 into Oxygen.
Answer:
The double helix describes the appearance of double-stranded DNA, which is composed of two linear strands that run opposite to each other, or anti-parallel, and twist together. Each DNA strand within the double helix is a long, linear molecule made of smaller units called nucleotides that form a chain.
Explanation:
4: One that produces asexually and has offspring that are genetically different.
If the environment changes, many members of a certain species may die and so it becomes less and less likely for that species to produce sexually, so it will die out. Furthermore, if the asexual species produces the same traits, that species will not adapt to changes in the environment and will also die out.
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