What are the basic building blocks of dna?

Im is in a crowd of people at the mall looking for his girlfriend tammy, who was supposed to meet him for dinner. jim realizes tammy is across the room as he catches a whiff of her overpowering perfume, 'paris #6'. which process explains why jim is able to smell the perfume?

Will someone me with this.. specialized cells which perform a particular function form: tissues organs or organism

Which of the following is a good strategy when it comes to desserts