The larval form of schistosoma mansoni uses a to it gain entry through intact skin.

The larval form of Schistosoma mansoni gains entry into the intact skin with the help of the proteases enzyme.

Explanation:

Parasitic worms, also known as Helminths, are eukaryotic multicellular parasites. These parasites produce certain molecules that help them to enter into the tissues of the host cell.

Example of a parasitic worm is the larval form of Schistosoma mansoni parasite. The larval form of this parasite is known as miracidium. The miracidium causes schistosomiasis or snail fever.

The miracidium gains entry into the intact skin with the help of the proteases enzyme, which the degrades the proteins of the skin.

a polymer is a chainlike molecule made up of small molecular units. these small molecular units are called monomers. monomers of polymer can be joined together either naturally or synthetically.  

answer; polycythemia is the correct answer;