Steps of the dna ladder are made up of six chemicals. o true o false

B. false

Explanation: the ladder is only made up 4 chemicals

exposure to hazardous carcinogens and toxic substances can cause breathing problems, such as copd and various types of cancer. it also increases the risk of heart attacks and strokes and has serious (but no less unattractive) side effects, such as aging, yellow teeth, a terrible smell and damage to the vocal cords.

frequency is the answer