A major distinction of cuttlefish from other squids is the presence of the cuttlebone. Primarily composed of aragonite, it is a porous, hard, and brittle structure found internally. The shell itself is chambered and made up of microscopic narrow layers connected by upright pillars (allthesea.com). The chambers become gas filled in the front and water filled in the rear to maintain the neutral buoyancy of the cuttlefish. The buoyancy allows the cuttlefish to hover over the floor of the oceans.
The wall of a jellyfish body is very fragile. Their bodies are much different then that of most animals. They have no brain, no respiratory system, and no circulatory system. The average length of a jellyfish tentacle is one to ten meters long. The tentacles of a jellyfish in some cases can grow to a massive length of 100 feet!
These segments are capable of forming a completely new black worm when detached from the host body, and in most Blackworms is the primary for of siring offspring. “Blackworms (Lumbriculus variegatus) are excellent organisms for studying the circulatory system and the effects of drugs on this system for three main reasons: their skin is transparent making it easy to observe pulsation rates, drugs quickly diffuse through the skin of Blackworms thus providing immediate effects, Blackworms are easy to maintain in a laboratory (Bohrer, 2006).” Blackworms have a dorsal blood vessel that pumps oxygenated blood from the posterior to the anterior end. This is done by a muscular contraction in the segments. The effects of temperature and chemical application of heart rate will be tested on the Blackworms in this lab. In most annelids, the body temperature of the worm will change with the environment.
The hull on the boat is the water tight body of the ship. The boat can be mounded, round, bilged, or soft chinned. The next type of boat is the round bottom hull. This boat is usually easier to maneuver at a slow speeds because it is larger then the other types of boats. It is usually used as a displacement hull.
What I find peculiar about the bull shark is its ability to live in both marine habitats and freshwater habitats. In general, being able to survive in both habitats is very uncommon for sharks. Aquatic organisms rely heavily on a process called osmoregulation that allows them to achieve homeostasis of water content within their body. Without going into too much detail on the specifics of osmosis and osmotic pressure, this process allows the organism to keep their internal fluids from getting too diluted or too concentrated. So you may be asking yourself, how does this apply to the bull shark?
MY QUESTION WAS: How do crustaceans obtain oxygen and what do they eat? The largest member of the arthropod family is the subphylum (crustaceans). Shrimps, crabs, lobsters, prawns, and barnacles are all examples of crustaceans. There are almost 30,000 species of crustaceans worldwide. They live in sea or fresh water.
Manta rays are huge in size so only sharks and killer whales can harm them and eat them. However, many manta rays survived from the attack of sharks or whales. It is amazing that manta can heal the wound of shark’s bite and after a few years their broken fins can eventually grow back. However, the population of manta ray is declining. According to some statistic, the catch of manta ray has increased in Indonesia since 2005.
Latest technological advances have increased the threat to the marine animal, especially for turtles. It's believed that many species of turtle already got extinct and seven species of turtle are in the verge of extinction. Olive Ridley is one among the seven breeds that are in the verge of extinction. Features of Olive Ridley Olive Ridley turtles have been around a very long time, more than 100,000,000 years. Olive Ridley sea turtles, Lepidochelys olivacea are small, hard-shelled marine turtles, one of the two species of the genus Lepidochelys, and a member of the Family Cheloniidae.
The majority of camouflage methods aim for crypsis, often through a general resemblance to the background, high contrast disruptive coloration, eliminating shadow, and countershading. In the open ocean, where there is no background, the principal methods of camouflage are transparency, silvering, and countershading, while the ability to produce light is among other things used for counter-illumination on the undersides of cephalopods such as squid. Some animals, such as chameleons and octopuses, are capable of actively changing their skin pattern and colours, whether for camouflage or for signalling. Military camouflage was spurred by the increasing range and accuracy of firearms in the 19th century. In particular the replacement of the inaccurate musket with the rifle made personal concealment in battle a survival skill.
Like other amniotes, turtles breathe air and do not lay eggs underwater, although many species live in or around water. Turtle, tortoise, or terrapin The word chelonian is popular among veterinarians, scientists, and conservationists working with these animals as a catch-all name for any member of the superorder Chelonia, which includes all turtles living and extinct, as well as their immediate ancestors. [citation needed] Chelonia is based on the Greek word kelone,[7] for armour or interlocking shields. [8] "Turtle" may either refer to the order as a whole, or to particular turtles which make up a form taxon that is not monophyletic. The meaning of the word turtle differs from region to region.