<span>The answer is helminths. There
are two types of helminths: roundworms (nemat-helminths) and flatworms (platy-helminths).
One of the major groups is the cestodes that are comprised of the tapeworms and
hookworms and the flukes (trematodes). Their life cycle usually involves eggs,
larvae, and adults with the eggs being the infectious agent</span>
<span>Exocrine acinar cells secrete several digestive enzymes, inlcuding amylase, lipase, and peptidases enzymes, which are only activated when they reach the duodenum. On the other hand, Epithicial cells, which reside in the pancreatic ducts, are the source of the bicarbonate and water secreted by the pancreas.</span>
Answer:
Internal respiration occurs in the respiratory membrane of metabolizing tissue. Inside the mitochondria, cellular respiration, which produces energy in the form of ATP, occurs. Cellular respiration requires oxygen and carbon dioxide is produced as a waste.
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