Http://www.healthline.com/health-slideshow/home-remedies-for-head-lice#1
This may help :)
An organ is a body structure composed of tissues that have related functions. The human body has levels of organization. <span>The cell is the basic structural and functional unit of a living organism which communicates with different and similar cells in order to work together and carry out all physiological processes. <span>Cells with similar structures are grouped together in a tissue to perform a shared function. A group of tissues forms an organ that together with other organs make organ system. The integrated activity of all the organ systems makes the whole organism.</span></span>
Using things such as the internet. For example, if a scientist wanted feedback, he could turn to an org of other scientists across the globe and get their help.
I'll give you the first one: it's a reactant of respiration. if you want the other answers just dm me so its easier to communicate
