in a controlled experiment, more than one independent variable should be changed in order to conduct an accurate experiment. true or false?

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?

Ineed some everybody. the production of cells during mitosis into specialized function is called: recombination or differentiation

What molecules does hemoglobin decay into over time