Some people want a challenge and feel like they are up for it.
Depends on who your testing it for and for what reason your testing it for the ages can go from 10- 18.
yes thats one reason they use animals
the main reason to do immunodiffusion test is to quantify antigen or antibody
start testing yourself
I'd like to test the air quality in my home. Can I get a do it yourself air quality testing kit?
You obviously do not know what you are doing. Electricity is DANGEROUS and you can kill yourself with it. If something electric in your house needs testing or fixing, employ the services of a qualified electrician to do it for you, DO NOT TRY AND DO IT YOURSELF.
You can purchase do-it-yourself radon testing kits for between $10 and $50. Having someone else test for you will cost between $50 and $150, so if you can, do it yourself.
the reason star testing doesn't affect your grade is because the testing is meant to rank your school, and to find outstanding individuals or mark out those that are lagging behind.
There are many reasons why people use animals for testing. One reason is that they don't want to risk killing a human.
you never want to hurt yourself, its not good for you no matter what the reason or cost.
many combustible gas indicators and explosion meters require oxygen for proper operation (generally 10- to 30-percent oxygen by volume)
because you do for some weird reason