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 .

Schools are being forced to embrace computers. unlike their "digital immigrant" teachers, these students are "digital natives", born into a world where technology is an integral part of everyday life. almost every student has access to a multitude of computers, laptops and tablet devices. it would be crazy to assume an assignment would  notbe written on computer in this day and age.many schools now have a 1-to-1 computer policy, and many districts and states in the united states have mandated computers or ipads across the state for every student,  including los angeles, the second largest school district in the country.but the thing is, when they tried it in la, it wasn't the success they hoped for. that's because the tablets weren't used as much as they expected. rather, it appeared there was a gap between the digital native's love of technology and their use of it in the classroom.this conflicted relationship with computers is also underscored by much of the literature on education. it is also highlighted in professional development and conferences such as  edutech.