Answer:
variable-interval.
to get good grades, you must study and pay attention to score high, since the tests are inconsistent and at unknown passages of time.
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Answer : Which was a main reason for creating the Articles of Confederation? to determine the power of states and the federal government. to have a tax system to generate money. to outline the role of individual citizens in government. to have a strong national government after the Revolutionary War.Aug 30, 2019
Answer:
Trilobites
Explanation:
The Phanerozoic Eon is characterized by the presence of organisms that possessed hard shells as an adaptation to the environmental conditions. Among these organisms, the most common hard-shelled animals were the trilobites.
Trilobites were present during most of the Paleozoic Era, which belongs to the Phanerozoic Eon. These animals were marine organisms with remarkable and unique phenotypes.
The body of a trilobite was composed of three segments: the cephalon, the thorax, and the pygidium (tail). In addition, they possessed an exoskeleton composed of chitin, which was the reason behind their hard shells. They shed their exoskeletons to be able to grow.
Trilobites are currently extinct.