When conducting scientific research, appropriate methods must be used to find information that is reliable and valid. angela was assigned a research project about human body systems for her anatomy course. she would like to focus on the immune system, and more specifically, the effects of hiv on the immune system. which of the following options would be the best way for her to conduct an online search about her topic? a. type in “human body systems” + hiv b. type in “immune system” + human c. type in “hiv immune system” d. type in “human immune system” + hiv effects

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?