Answer: B
Explanation: The circulatory system is responsible for bringing food and oxygen to every cell in your body. The respiratory system is responsible for carrying oxygen and carbon dioxide in and out of your body. The excretory system is responsible for removing waste from your body.
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Answer:
RNA splicing is necessary for the Eukaryotas.
Explanation:
Splicing mean to joint or to connect. It is a post transcriptional modification of mRNA. Splicing is important to Eukaryotas because it contains introns and exons in gene. The removal of introns are done by splicing because it is necessary for the translation of mRNA into protein.
They can conserve energy and resources by regulating their activities, producing only those genes necessary for the cell to function.
Answer:
Coelenterates are the first invertebrates to develop a true nervous system.