There are three major types of cells in the lymphoid tissues of the body. One category, the , contains immunocompetent cells that are able to destroy or immobilize foreign substances in the body; these foreign substances are called . The two varieties in this group are and . The other class of protective cells are called . These defend the body by engulfing, or , foreign substances. The third cellular group are the , fibroblast-like cells that form the stroma or framework of the lymphoid organs. Lymphoid tissue is specifically classified as a type of connective tissue called . When lymphoid tissue is loosely packed, it is called ; when it is tightly packed into spherical masses, the arrangement is said to be .

How do symptoms created by inflammation the doctor

Examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. polyploidy is creating new species. the two populations are not interbreeding freely. hybrid offspring of the two populations begin to appear. one species will increase into a population size twice as large as the other species.

The human genome project is devoted to mapping the general dna sequence of our species. this could lead to the development of new medicines, as well as the possibility of using gene therapy to treat certain diseases. however, there are some ethical issues surrounding the mapping of individual genomes. one concern is a) that your genes may change over time, making the project useless. b) that insurance companies could discriminate based on genetic make-up. c) that since this has never been done before, we should probably not do it now. d) that sequencing our individual genomes is so expensive, it is a counter-productive strategy.