other lab groups investigating the same question average growth rates of the plants published in a book an experiment of different plants in the same environment a new experiment done with larger plants
A lab group investigates the growth rates of four plants grown near a classroom window. The group's conclusion is most strengthened by similar data from which of these sources?

Options:
- other lab groups investigating the same question
- average growth rates of the plants published in a book
- an experiment of different plants in the same environment
- a new experiment done with larger plants

other lab groups investigating the same question