Severe cases can even lead to death. Best way to protect yourself from getting the flu? Get an annual flu shot. When is flu season? The flu season occurs in the fall and winter, but the virus can stay active year-round. Is the flu virus contagious? Yes, it is very contagious. You can have the flu for 1 to 4 days before you start feeling sick.
Some mollusks have bilateral symmetry. Mollusks include gastropods such as snails, bivalves such as oysters, and cephalopods such as squid. Some bivalves have bilateral symmetry. Some mollusks have bilateral symmetry. Mollusks include gastropods such as snails, bivalves such as oysters, and cephalopods such as squid.
Mollusca are in broadened terms coelomates, or animals with a true coelom. This means their gut is suspended by mesenteries in a fluid filled cavity called the coelom. However â¦ , cephalopoda, or squids and octopi, are the only mollusks with a closed circulatory system so they are have TRUE coeloms.All the other classes of mollusca are what are known as hemocoels because of their lack of a pericardium and open circulatory.owever â¦ , cephalopoda, or squids and octopi, are the only mollusks with a closed circulatory system so they are have TRUE coeloms. All the other classes of mollusca are what are known as hemocoels because of their lack of a pericardium and open circulatory.