According to Biology Resources, the amoeba does not have a cell wall. Amoebas are single-celled organisms called protozoans.
The structure of the amoeba is that of the protozoan. They are microscopic organisms. The type of amoeba studied in labs is the amoeba proteus, which is only 0.3 mm in diameter.
The creature is made up of only a single cell, and it has only a nucleus and cytoplasm. The amoeba has no chlorophyll or cell walls, so it takes in and digests solid food. It's possible to find these creatures in ditches, ponds, soil and moist locations.
The outer layer of the amoeba's cytoplasm is called an ectoplasm. It is a clear gel. The rest of the creature is primarily made up of endoplasm, which is more like a fluid that contains minute structures and granules. Uniquely, an amoeba does not have a typical shape and changes all the time; it changes particularly often when needing to move or feed.
Surprisingly, amoebas do not have flagella or cilia to help them move. They instead move by flowing the cytoplasm over mud, soil or other surfaces. When they need to eat, amoebas surround the microscopic plant or food source with pseudopodia. The food is then digested with enzymes produced by the amoebas.Learn More
Mammals are distinguished from other animals by having mammary glands and complex hair follicles, and by the structure of their skulls, which feature highly modified jaw bones. Mammals are also warm-blooded and have a number of adaptations to allow for high metabolism.Full Answer >
The difference between a lizard and a salamander is that a lizard is a reptile and a salamander is an amphibian. Reptiles live solely on land, while amphibians spend part of their time in the water. Hence amphibians need to be near a source of water while reptiles don't.Full Answer >
Sand dollars are actually the skeletons of marine echinoderms and take their off-white, chalky form after the animal dies. They are closely related to flat sea urchins, starfish and sea cucumbers. When alive, they are covered in short, fine spines and range in color from yellow to blue and purple.Full Answer >
Remora and sharks have a commensalism relationship which, according to the Encyclopedia Britannica, is a relationship between two species in which one benefits from the other without either being harmed. Commonly called a suckerfish, the remora is a pelagic marine fish that attaches to the shark and feeds on it. Unlike parasitic species, the remora does not penetrate the flesh of the shark or otherwise cause it damage.Full Answer >