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.
Some species, such as native slugs, have soft, jelly-like eggs, while flax snails and kauri snails have eggs with a hard, calcified shell. The eggs can be quite large - up to about 13 mm in diameter in giant snails. The eggs develop for some time; the young snail and slug hatchlings resemble adults.