OPEN
Frogs have a double circulatory system, which means that circulation goes from the heart to the lungs (where it becomes oxygenated), then returns to the heart, then is pumped to the rest of the body (which takes the oxygen), and then returns to the heart. They have a closed circulatory system, which means that the blood travels through the body in vessels. Frogs have a three-chambered heart.
Mammals including humans have closed circulatory systems, as do most vertebrates. Some invetebrates also have closed systems. Examples of open circulatory systems are most arthropods, including molluscs and crustaceans and insects.
In Europe.
Alaskan King Crab
Yes it is a major Alaskan export.
500-1000
Crabs possess a complex body system that includes an exoskeleton, which provides protection and support. They have a segmented body divided into the cephalothorax (which combines the head and thorax) and the abdomen. Crabs utilize a circulatory system that is open, meaning that blood flows freely through cavities rather than being confined to vessels. Additionally, they have specialized respiratory structures called gills for breathing underwater.
The capacity of a crab pot for Alaskan King Crabs typically ranges from 100 to 300 crabs, depending on the size of the pot and local regulations. However, it's important to note that the actual number can vary based on the size of the crabs and the specific design of the pot. Fishermen must also adhere to regulations regarding size limits and catch quotas to ensure sustainable harvesting.
http://www.adfg.state.ak.us/pubs/notebook/shellfsh/kingcrab.php Pretty much snails, shellfish, mussels, clams, worms, other crabs...
Alaskan king crabs typically take about 7 to 10 years to reach a size large enough for harvesting, which is generally around 6.5 inches in carapace width. Their growth rate can vary based on environmental conditions, availability of food, and other factors. Harvesting regulations ensure that crabs are of adequate size to maintain sustainable populations.
Alaskan king crab can be caught in Auletian Islands, islands in Alaska region. Another places where the crabs can be caught are in Russia and also international waters.
yes crabs do have intestines because in order for them to have a digestive system you need intestines to help digest foods