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.
Starfishlike brittle stars have five thin arms and no central brain, but even so, they move in a carefully coordinated fashion similar to four-limbed animals (including humans). A new analysis delves into the details of brittle star locomotion. Symmetry is at the heart of the mystery of brittle star movement. Humans, and many other animals, from insects to birds, have bodies divided into two matching halves, a right and a left. Scientists describe this as bilateral symmetry. Other animals, including jellyfish and sea anemones, have bodies that can be divided into matching halves in multiple ways. This is called radial symmetry. Brittle stars fit into this category; their bodies can be divided into matching halves five different ways.