Cytotoxic T cells and NK cells that form during a cell-mediated immune response are helpful in addressing .
a. atherosclerosis
b. HIV
c. cancer
d. rheumatoid arthritis
e. allergies

Hydrilla (hydrilla verticillata) is an invasive aquatic plant and one of the most serious aquatic pests in florida. hydrilla has already been introduced to hundreds of bodies of water throughout florida, hydrilla is difficult to control because it grows rapidly and survives in many different water depths and conditions. hydrilla • describe how hydrilla affects native plant and animal species. include both a biotic and an abiotic limiting factor. • suggest one biotic and one abiotic recommendation that could slow the spread of hydrilla

20 the compound al(nh3)2 has atoms of nitrogen.

Number and variety of living organism; includes genetic, species, and ecological types