Overview. Iron-deficiency anemia is a common type of anemia. The term anemia usually refers to a condition in which your blood has a lower than normal number of red blood cells. Red blood cells carry oxygen and remove carbon dioxide (a waste product) from your body.
The Y chromosome is one of two sex chromosomes (allosomes) in mammals, including humans, and many other animals. The other is the X chromosome. Y is the sex-determining chromosome in many species, since it is the presence or absence of Y that determines the male or female sex of offspring produced in sexual reproduction. In mammals, the Y chromosome contains the gene SRY, which triggers testis development.
In the expression 3 x + 7, 7 is a constant. A number that is in a term all by itself. In the expression y = 2 x â 16, 16 is a constant. A term that is just a number, not multiplied by a variable or anything else. It's just along for the ride.