Ben was playing outside and started having difficulty breathing. the teacher sends ben to the nurse. the school nurse listens with a stethoscope and hears a wheezing noise. what type of disorder may ben have?

Astudent is looking through a microscope at some cells of an onion root tip. many of these cells are undergoing division since the root tip grows quickly and requires more cells. which cell most recently underwent metaphase? w x y z

Atype of organism that no longer exist on earth is said to be

What name is given to the process in which a strand of dna is used as a template for the manufacture of a strand of pre-mrna?