Cnidarians

They are both producers of food

No, hydra hasn't been proven real and is labeled a myth

This is a trick question. Because hydras are only two cell layers thick, they do not have a true circulatory system. The inner cell layer absorbs materials directly from their gastrovascular cavity. So a hydra doesn't have blood!

Amoebas are single-celled organisms that move by extending their cell membrane called pseudopods, while hydras are multicellular organisms that belong to the phylum Cnidaria and have tentacles around their mouths for feeding. Amoebas lack specialized tissues and organs, while hydras have a simple body structure with a basic nervous system, digestive system, and reproductive organs.

Hydra is one of Pluto's moons, and its surface temperature is estimated to be around -230 degrees Celsius (-382 degrees Fahrenheit). This extreme cold is due to its distance from the sun and Pluto's overall frigid environment.

The free floating body form of cnidarians is called a medusa. Medusae have a bell-shaped body with tentacles hanging down, and they are often seen swimming in the water. Examples include jellyfish and hydromedusae.

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A hydra typically has two cell layers: an outer layer of epithelial cells and an inner layer of gastrodermal cells. These layers are separated by a jelly-like extracellular matrix called the mesoglea.

The digestive enzymes in Hydra are produced in their cells, specifically in the gastrodermis, which lines the inner cavity of the body column. These enzymes help break down food particles that are ingested by Hydra for absorption and nutrient acquisition.

Hydra belong to the phylum Cnidaria and the class Hydrozoa.

The class of cnidarians that typically only live as polyps is the Anthozoa. This class includes sea anemones and corals, which exist primarily as polyps and do not have a medusa stage in their life cycle.

A hydra typically has only one opening, which is its mouth located at the center of its tentacles. This opening is used for both ingesting food and expelling waste.

No, cnidarians do not have spicules. Spicules are small, needle-like structures made of calcium carbonate or silica that are found in some sponges and echinoderms for support and defense. Cnidarians, such as jellyfish and corals, have a different type of support structure called a mesoglea.

B for Plato users

but it is a tissue level of organization

No, a free swimming form of a cnidarian is called a medusa. Polyps are typically attached to a substrate and have a cylindrical body with a mouth surrounded by tentacles at one end. Medusae have a bell-shaped body with tentacles hanging down.

Cnidarians do not have a centralized digestive system like other animals. They capture small prey using tentacles armed with stinging cells called cnidocytes. Once caught, the prey is pushed into a central cavity where digestion occurs. The nutrients are then absorbed through the body wall.

The presence of only two tissues layers makes cnidarians diploblastic. These tissues layers consist of an epidermis (outer layer) and a gastrodermis (inner gut layer). Mesoglea, a type of jelly-like substance is between these layers.

No, hydras cannot breathe fire. They are mythical creatures with multiple heads and regenerative abilities, but fire-breathing is not a characteristic associated with them in mythology or fictional portrayals.

A hydra is an invertebrate animal.

No, an octopus would be an example of a mollusk (not a cnidarian).

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Another Viewpoint:

There are a lot of galaxies in the constellation of Hydra.

The distance to the main cluster of galaxies (called Hydra 1) is about 165 million light years.

This cluster of galaxies has a redshift. Remember the redshift only shows the motion directly away from Earth.

The best estimate I have found of how fast it's moving away from Earth is

a speed of 0.0114 times the speed of light.

That can be written as 0.0114 c.

That's quite a bit different from the answer given above.

No. Most microscopic organisms are much too tiny to have a heart.

Yes, jellyfish are members of the cnidarian class. They are gelatinous marine animals with umbrella-shaped bells and tentacles that possess specialized stinging cells called cnidocytes, which they use for capturing prey and defense.