Whether it is brand-new or years old, a mattress too soft for your comfort level may make for many restless nights. As long as the mattress is in good shape, there's no need to replace it to achieve the desired level of firmness.Instead, purchase a firm topper, slide a bed board beneath the mattress, or add extra support to the bed frame itself. sheet of plywood cut to the same size as the mattress offers support for a mattress that has lost some of its firmness. Slide the plywood between the mattress and box spring.
Human cells normally contain 23 pairs of chromosomes, for a total of 46 chromosomes in each cell (illustration). A change in the number of chromosomes can cause problems with growth, development, and function of the bodyâs systems.
There are 46 total chromosomes in a normal human body cell. They pair up, creating 23 pairs of chromosomes. Mutations can occur during cell division, causing human cells to have a varied amount of chromosomes-more or less. There are many genetic diseases caused by chromosomal mutations.here are 46 total chromosomes in a normal human body cell. They pair up, creating 23 pairs of chromosomes. Mutations can occur during cell division, causing human cells to have a varied amount of chromosomes-more or less. There are many genetic diseases caused by chromosomal mutations.