What does an antiseptic do? Why would an antiseptic be dangerous to humans if it killed all bacteria?

Normally, antiseptics weaken and slow the growth of bacteria and other microorganisms, which in turn helps to prevent the bacteria from causing further infection. Antibiotics, are responsible for killing bacteria as well as some types of fungi and parasites.

Explanation:

fir trees are found in areas with cooler climates. fir trees have needles for leaves and remain green year-round.