Answer: technology
Explanation:
Because of how advanced our technology has come it has improved medicine
A little trick i learnt: The atomic number reflects how many electrons there are, and there must be an equal charge. therefore, there are the same amount of protons as there are electrons. so if it has 81 protons, we look for number 81 in the periodic table, Thallium
Answer is A. restriction enzyme
In biology ,Restriction enzyme is known as a scissor.