Amoeba vs. Hydra — What's the Difference?

A protective, dormant form that some organisms, like amoebas, form to survive adverse conditions.

A flexible, elongated organ used by some aquatic animals, like hydras, to capture prey or sense the environment.

The central part of a cell containing genetic material.

The outermost layer of cells in multicellular animals, such as the epidermis in hydras.

The process by which cells internalize substances by engulfing them in a vesicle.

The process by which organisms regrow lost or damaged body parts.

An amoeba (; less commonly spelt ameba or amœba; plural am(o)ebas or am(o)ebae ), often called an amoeboid, is a type of cell or unicellular organism which has the ability to alter its shape, primarily by extending and retracting pseudopods. Amoebae do not form a single taxonomic group; instead, they are found in every major lineage of eukaryotic organisms.

A specialized cell in cnidarians containing a stinger used for capturing prey.

Any of various one-celled free-living or parasitic protozoans having no definite form and moving by means of pseudopods.

The inner layer of cells lining the gastrovascular cavity in hydras and other cnidarians.

(biology) A member of the genus Amoeba of unicellular protozoa that moves by means of temporary projections called pseudopodia.

Greek Mythology The many-headed monster that was slain by Hercules.

(mathematics) The graph of the real part of the logarithms of a polynomial equation in complex numbers.

(Astronomy)A satellite of Pluto.

A rhizopod common in fresh water, capable of undergoing many changes of form at will. Same as ameba. See Rhizopoda.

A constellation in the equatorial region of the southern sky near Cancer, Libra, and Centaurus. Also called Snake2.

Naked freshwater or marine or parasitic protozoa that form temporary pseudopods for feeding and locomotion

A persistent or multifaceted problem that cannot be eradicated by a single effort.

Any of several small solitary freshwater hydrozoans of the genus Hydra and related genera, having a cylindrical body and a mouth surrounded by tentacles.

Any of several small freshwater polyps of the genus Hydra and related genera, having a naked cylindrical body and an oral opening surrounded by tentacles.

(fantasy) A dragon-like creature with many heads and the ability to regrow them when maimed.

A complex, multifarious problem or situation that cannot be solved easily and rapidly.

A serpent or monster in the lake or marsh of Lerna, in the Peloponnesus, represented as having many heads, one of which, when cut off, was immediately succeeded by two others, unless the wound was cauterized. It was slain by Hercules. Hence, a terrible monster.

Hence: A multifarious evil, or an evil having many sources; not to be overcome by a single effort.

Any small fresh-water hydroid of the genus Hydra, usually found attached to sticks, stones, etc., by a basal sucker.

A southern constellation of great length lying southerly from Cancer, Leo, and Virgo.

(Greek mythology) monster with nine heads; when struck off each head was replaced by two new ones;

A long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer

Trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality;

Small tubular solitary freshwater hydrozoan polyp

Amoebas can live in both freshwater and saltwater environments.

A hydra captures prey with stinging tentacles that paralyze the victim.

It's a cavity where digestion and nutrient absorption occur.

No, an amoeba is a single-celled organism.

Hydras usually remain attached to surfaces or move slowly using their tentacles.

Pseudopodia are used for movement and capturing food.

Yes, a hydra is a freshwater cnidarian.

Amoebas obtain food by engulfing particles via phagocytosis.

Hydras prefer freshwater environments.

Yes, hydras have remarkable regenerative abilities.

No, amoebas are unicellular and lack specialized tissues.

Hydras have a simple, tubular body structure with specialized tissues.

Yes, by forming cysts.