The root consists of a single process or fang as in incisors and canines, or of two processes or fangs as in premolars and lower molars and three in upper molars. Kindly explain these lines. please answer ASAP

What are the seven economic and social goals?

Cells destroy body cells infected by a virus or bacteria.

Which best describes a benefit of using dna technology in medicine? a) medicine can be produced in mass quantities. b) medicine can be distributed at a reduced cost. c) medicines have fewer side effects. d) medicines are resistant to antibiotics.