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3 years ago

How are the fluke larvae transferred from the snail (invertebrate host) to the vertebrate host?

Biology

1 answer:

Vesna [10]3 years ago

7 0

The eggs of the fluke are passed into water supplies from feces and urine of infected people. After hatching the parasite actively swims and invades the body of a snail, usually by penetrating through the snail's foot. The parasite requires the presence of certain species of snails (e.g., Oncomelania, Biomphalaria, Bulinus) to transform (and multiply) itself into an infective stage, called cercaria.

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The correct answer is C

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Answer:

The phylum Hemichordata is the one that could form an evolutionary connection between the chordates and non-chordates.

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To the phylum Hemichordata belongs a genus that scientists believe could explain how the chordates could evolve from the non-chordates. This genus is Balanoglossus, of the class Enteropneusta.

Balanoglossus is similar to a worm, whose habitat is the seabed, and like other hemicordates it has a stomach, a structure that forms part of its digestive system and fulfills the functions of a spine.

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Chordates and non-chordates brainly.com/question/1387264

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