I think 1? Not sure which is boy and which is girl but
<span>Carl Linnaeus was born May 13th, 1707 and died January 10th 1778 aged 70 he was a Swedish botanist which means he performed scientific studies of plants, [ he was also a physician also known as a medical practitioner or medical doctor and a zoologist which is the study of animals. He also started the scheme of nomenclature which is the naming of species of animals and plants; he is also known as the "father of modern taxonomy" taxonomy sometimes alpha taxonomy meaning the science of finding, describing and categorising organisms </span>
The answer is; UV (ultraviolet)
The security pens use UV light to illuminate some marking on an object,such as a watermark, to identify its authenticity or owner. The markings are usually invisible to the naked eye under visible light. The marks are only visible when illuminated with UV light. This is because the marking is made of a fluorescent material that absorbs light of a shorter wavelength (this case UV) and emits a longer wavelength (this case visible light).
