Which of the following refers to an organism that has the following characteristics: Elongated marine worms that live in a chitinous tube that they secrete; the tube is often buried in the ground so that only the lophophore sticks out, and the lophophore contains numerous tentacles?

The question is incomplete,below is the complete question.

Which of the following refers to an organism that has the following characteristics: Elongated marine worms that live in a chitinous tube that they secrete; the tube is often buried in the ground so that only the lophophore sticks out, and the lophophore contains numerous tentacles?

A) Bryozoan

B) Phoronid

C) Mollusk

D) Annelid.

The correct answer is option D

Phoronid

Explanation: A Phoronid is a small aquatic animal that filter it's food with a crown of tentacle known as lophophore, A Phoronid body is soft so it builds special structures to support and protect the body,these structures are in form of upright/standing tubes made of chitin (a fibrous substance consisting of complex sugar, polysaccharides).

Phoronids are sometimes known as horseshoe worms and they are found in abundance in shallow marine sediments.

Phoronids are unsegmented and are of member of the invertebrate phylum phoronids.

Phronids

Explanation:

phronids are underwater animals characterized by their ability to filter feed. they feed with their lophophore also known as a crowned tentacle. The lophophore contains cilia at its sides which helps to draw food in.

tsd is temerature dependent sex determination.

tsd: it is a type of environmental sex determination in which the temperature experienced during embryonic/ larval development (ambient temperature for development) determine the sex of the offspring.

crocodile displays the tsd where the ambient temperature of the developing egg determines the individual's sex. for example in the american alligator's eggs, incubation at 33 ºc produces mostly males, while incubation at 30 ºc produces mostly females. so if the american alligator's egg will get the ambient temperature (33 degree celcius)during embryonic development from egg, the offspring will be male and same for the female sex determination.

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.