Explain why we are more likely to get several colds every year but if we have the chicken pox once we are likely never to get it again. Use keywords: memory cells, white blood cells, immunity, antigens, Jantibodies

The condition in which joints are inflamed is bursitis select the best answer from the choices provided ot f

Which of the following sex and generation combinations directly produces the pollen tube of angiosperms? a) male gametophyteb) female gametophytec) male sporophyted) female sporophyte

How is the national wildlife refuge system similar to the pacific region coastal program? a. both programs are concerned with providing habitats for wildlife b. both programs are primarily concerned with preserving fish species c. both programs have set aside 150 million acres of land d. both programs are under the u.s. fish and wildlife service