Why is a high-dose flu shot available for people 65 and older? As people get older, their natural immune defenses can weaken and they can get sick more easily. The high-dose flu shot contains four times more antigen (active ingredient) than a regular flu shot. This helps older people develop a better immune response, gives better protection against the flu and also helps prevent flu-related complications.
Dogfish sharks are fish; fish are vertebrates, and all vertebrates have bilateral symmetry. This means they have symmetry across one plane (known as the sagittal plane, and directly down the centre of their body), which means one side of their body approximately mirrors the other side.n the northeast Pacific Ocean estimates of the age at maturity for female spiny dogfish have ranged from 20 years and 3 feet (92cm) to 35.5 years and 3.1 feet (94cm. 2 people found this useful.
Echinoderms are characterized by their radial symmetry, water vascular system and internal skeleton. The most striking feature of all echinoderms is their pentamerous radial symmetry.That is, the body can be divided into five parts (or appendages) which point outward from the center of the body. Interestingly, although most mature echinoderms are radially symmetrical, the larvae usually have bilateral symmetry.ea stars, also known as âstarfishâ, are probably the most well known echinoderm of the sea. The common name âstarfishâ is quickly being replaced by the more accurate term âsea starâ. Since starfish have no relation to fish, the term âsea starâ is preferable.