Stereoscopes, 3-D movies, and stereograms all create illusions of depth by relying on the perceptual principle of:

When human cells are grown under laboratory conditions that encourage them to grow and divide, cells

from human embryos stop dividing after about 50 divisions. from children divide more quickly than those of adults. lose their DNA. continue to reproduce themselves forever.

Another name for tracking is:

A) performance goal structuring. B) ability grouping. C) curriculum channeling. D) vocational training.