Which group within the Protista probably gave rise to sponges on what evidence do you base your answer?

W

Which group within the Protista probably gave rise to sponges on what evidence do you base your answer?

Which group within [the protist kingdoms] probably gave rise to sponges? On what evidence do you base your answer? The protist ancestor was probably a choanoflagellate. Choanoflagellates resemble the choanocytes of sponges both in their morphology and in DNA sequences.

Where is the feeding tube for dugesia located?

A live brown speckled planarian {Dugesia tigrina} feeding on a small piece of Thymus. The planarian’s pharynx, a feeding tube that extends from its gastrovascular cavity (digestive tract) tract), is easily visible connecting the mid-section of the worm to the food.

What is the advantage of a gastrovascular cavity?

What is the advantage of a gastrovascular cavity that ramifies throughout the body? Higher surface area for the distribution/absorption of nutrients.

What would happen to a cnidarian that could no longer carry out extracellular digestion?

What would happen to a cnidarian that could no longer carry out extracellular digestion? -Cnidarians are not capable of extracellular digestion. -The animal would no longer be able to digest food. Intracellular digestion would still be possible for the digestion of food.

How do sponges and cnidarians exchange gases with the environment?

Like the sponges, Cnidarian cells exchange oxygen, carbon dioxide, and nitrogenous wastes by diffusion between cells in the epidermis and gastrodermis with water.

How do Cnidocytes with their nematocysts function?

The nematocysts (cells) of cnidocytes (organelles) are small, barbed, and harpoon-like so they can sting and paralyze and capture prey or be used to sting and other organisms in their defense.

How does Dugesia feed?

The eversible proboscis of Dugesia helps in feeding. The pharynx in section is circular enclosed in a circular pharyngeal cavity.

What is an advantage of having a complete digestive system over a Gastrovascular?

Complete digestive systems are better able to absorb nutrients, since each organ is separate and can specialize. It also allows for continuous intake of food, which lets animals grow bigger and develop more complex structures.

What protects us from choking by covering the windpipe so that food goes down the esophagus?

epiglottis The 7. large protects us from choking by covering the windpipe so food goes down the esophagus.

How do cnidarians capture and consume their food?

All cnidarians are carnivores. Most use their cnidae and associated toxin to capture food, although none is known actually to pursue prey. The mouth opens, the lips grasp the food, and muscular actions complete swallowing.

About the author

Add Comment

By Admin

Your sidebar area is currently empty. Hurry up and add some widgets.