Inelastic demand is the opposite. People will buy goods with an inelastic demand no matter what the price is. A good example of this would be gas. People complain and complain about gas prices, yet they still buy it because they need it, even if it $3 a gallon. Another example would be life-saving medications.
They have tube-like bodies and a numâ¦ber of tentacles that contain stinging cells called cnidocytes that they use to catch their prey. They have radial symmetry. Hydras are predatory animals belonging to the phylum Cnidaria and the class Hydrazoa. They are related to such things as jellyfish and coral. Specifically, THE Lernean Hydra was a serpent-like creature from Greek Mythology. It was an ancient water beast that possessed many heads and poisoned breath.
They are in Porifera. Porifera is divided into three classes-Calcispongaie, Hylospongaie and the largest of all, Demospongaie, to which redbeard sponges belong to. Poriferans â¦ are multi-cellular organisms which remain attached to the bottom and have spicules.     Porifera.