An experiment tested the hypothesis that exposure to pesticides decreases immune function in tadpoles.  The researchers raised tadpoles in groups, in containers of the same size in a room with consistent temperature and lighting.  They exposed some tadpoles to no pesticides, some to low pesticide levels, and some to high pesticide levels, and then measured the density of white blood cells (immune cells) in the tadpoles.  Part a: The researchers used a(n) ______________ experiment to show the effects of pesticides on tadpoles. Group of answer choices A. natural history B. laboratory C. field D. quantitative model E. observational   part b:   What is the dependent variable in this experiment? Group of answer choices A. consistent temperature B. density of white blood cells C. level of pesticides D. intensity of lighting E. number of tadpoles   part c: The negative control treatment in the experiment was the: Group of answer choices A. tadpole group receiving no pesticides. B. tadpole group receiving high pesticide levels. C. size of the containers. D. density of white blood cells. E. conditions of the laboratory.   part d:   The function of the “no pesticide” treatment in this experiment is to: A. standardize the conditions of the experiment across treatment groups. B. show the positive effects of pesticides on tadpole immune function. C. elucidate how pesticides are harmful for all animals. D. increase the sample size in the experiment. E. show if a decrease in white blood cell density could be caused by a factor other than pesticides.

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Immunology

Immunology is the division of science involved with the immune reactions occurring in living organisms. The organisms are accustomed to evolving internal defense mechanisms to evade the invasion of microbial pathogens. Diverse cells are connected with stimulating the immune responses, which produce inhospitable conditions to the microbes prompting their lysis and thus inhibits the multiplication of the pathogens. The immune system can distinguish the pathogens through the aid of cellular intercommunication and launch responses to destroy them.