6.a ray of lights is travelling in grass reaches a boundary with air and split into two arrays as shown

a. it has been partially internally reflected

b. it has been partially internally refracted.

c. it has been totally internally reflected.

d. it has been totally internally refracted.

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.