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.
But it is on its own terms that the Spiny Dogfish really excels. This species is basically a deep-sea shark that has secondarily re-invaded shallow, near-shore waters. The Spiny Dogfish seems to prefer cold waters between 45 and 59 degrees Fahrenheit (7 and 15 degrees Celsius).art of the Spiny Dogfish s predatory secret is its teeth and jaws. Its teeth have oblique cusps with overlapping bases, forming a nearly continuous cutting edge. Spiny Dogfish jaws are short, transverse, and thickly muscled equipment for a powerful bite.