Members of which of the following phyla have the most species that parasitize humans? a. porifera b. mollusca c. echinodermata d. platyhelminthes

The correct answer is-

d. Platyhelminthes.

Platyhelminthes is a phylum of invertebrates that includes flatworms such as Tapeworms, Flukes. Most of the members that act like parasite belong to the class Tremada ( which includes flukes) and Cestoda ( which includes tapeworms) within this phylum.

They can parasitize human beings ( for example- Fascioliasis is an infectious disease caused by Fasciola hepatica, which is commonly called liver fluke).

Thus, option d) is the right answer.

fabric is silk wool ext. paper isnt

explanation:

u cant make fabric out of paper cause paper comes from wood while fabric comes from animals

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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