Ais developed through the scientific method, and it can be modified or improved upon. it may be represented by a model. as seen here, three different models were used to represent atomic structure as ideas changed over time.

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell

How have high taxes on tobacco products impacted the number of people who use them? a. the number of tobacco users has increased. b. the number of tobacco users has decreased. c. the number of tobacco users has not changed. d. the number of adolescent tobacco users decreased, while the number of adult users increased

The illustration shown is an ovum, a female sex cell. a mutation in this cell may be passed to the woman’s offspring during a) birth. b) mitosis. c) dna replication. d) sexual reproduction