1 Babies under 6 months of age. 2  Although the vaccine is not harmful to babies less than 6 months old, it does not work. 3  If your child has a serious allergy to thimerosal (a preservative in contact lens solutions and the flu vaccine), a thimerosal-free vaccine should be given.f you have children younger than 5 years old or who have health complications, everyone living in the house should get a flu shot. This is especially important if you have children under 6 months old or a member of your household who is pregnant. Pregnant women should be immunized.
The Cambrian Period is the first geological time period of the Paleozoic Era (the âtime of ancient lifeâ). This period lasted about 53 million years and marked a dramatic burst of evolutionary changes in life on Earth, known as the Cambrian Explosion..
The Cambrian spans from 541 million years to 485 million years ago and is the first period of the Paleozoic and of the Phanerozoic Eon. The Cambrian sparks a boom in evolution in an event known as the Cambrian Explosion in which the largest number of creatures evolve in the history of Earth during one period.he Paleozoic Era ended with the largest mass extinction in Earth's history, the PermianâTriassic extinction event. The effects of this catastrophe were so devastating that it took life on land 30 million years into the Mesozoic to recover. Recovery of life in the sea may have been much faster.