What concentration of alcohol is best suited for use as an antiseptic agent

During an investigation of an xss attack, the investigator comes across the term "[a-za-z0-9\%]+" in analyzed evidence details. what is the expression used for?

Jane is blood type a her husband is blood type b. jane is puzzled because their daughter is type o. explain how the daughter inherited a blood type that neither of her parents had explain your answer

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?