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.
Asymmetrical animals (sponges, shown in Figure 4) have no general body plan or axis of symmetry that divides the body into mirror-image halves. Within the animal kingdom this appears to be a primitive condition.More advanced animals have symmetry.he phylum Porifera (pore-bearing) consists of approximately 5,000 species of sponges. These asymmetrical animals have sac-like bodies that lack tissues, and are usually interpreted as representing the cellular level of evolution.