A. <span>Exposure to an antigen
Exposure to viruses and antigens led to the foundation of modern vaccination. Vaccination introduces an antigenic material that helps the ability of the immune system to adapt a specific pathogen, therefore leading to a long-term immunity.</span>
- Can change in the structure of chromosome affect in health and development . These changes can affect many genes along the chromosomes and disrupt the proteins made from those genes.
_-_ hOpe that this really helpss youu well, and have a GREAT BRAINLY DAY .
The correct answer is - 1) inverted pyramid, with a narrow base representing a small number of young individuals.
The populations that are decreasing are usually population in countries that are highly developed. The conditions for living are excellent, the medical care on high level, life expectancy very high, but the birth rates very low.
In this type of conditions, there's smaller and smaller number of young individuals, with the middle aged population being much bigger, and the older population being constantly on the rise. This will give the age-structure histogram a reverse shape than what it is supposed to have, it will be similar in appearance like a inverted pyramid, meaning that the population is aging and that it will be constantly on a decline in the future.
Metastatic melanoma ( if i’m not wrong )
cancer that begins in the skin cells, which spreads to other parts of the body ( in this case liver and brain)
It can be called<span> a draw, a wash or a gulch</span>
