Achange occurs in an environment that lasts for several thousand years and causes changes to the gene
several species. what can be known about this change?
it is short-term
it is long-term
it involve an el niño storm.
it involves a la niña storm.

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.