Community: <span>a group of people living in the same place or having a particular characteristic in common.
Population: </span><span>all the inhabitants of a particular town, area, or country.</span>
<span>Heavy drinkers are about C. nine times as likely to abuse drugs than non-drinkers.
Those who abuse alcohol will also likely abuse drugs as well. This especially refers to heavy drinkers who rely on alcohol to make them forget about their daily lives. At one point, alcohol won't be enough for them, which is why they will also incorporate illegal drugs into their daily lives.</span>
The true statements about he T cell receptors are 1, 2 and 4.
T cell receptors are the molecules found on the surface of the T lymphocytes. V(D)J recombination is the unique mechanism of genetic recombination that occurs only in the lymphocytes during the early stages of T and B cell maturation resulting in the T cell receptors. They recognize antigen fragments bound to MHC molecules. Majority of the T cell receptors consists of an alpha chain and a beta chain and a few with gamma and delta chains. Each chain is composed of a variable and a constant region. Within these chains are the complementary determining regions (CDRs) which determine the antigen to which the T cell receptor will bind.
Gene regulation is necessary in the development of multi-cellular organisms because it is necessary to make sure certain things go where they are needed to go. Multi-cellular organisms have more organ systems, therefore depend on more cells to live. Cells have a memory; the genes a cell expresses and the way it behaves depend on the cell's past, as well as its present environment.
Answer:
Somatic cells include a all except skin cells