Read the excerpt.
Which type of keyword is "Deforestation"?
Deforestation
Rain forests clean the air by producing oxygen. They are
also known to affect the water cycle and weather. The threat
of deforestation, however, means that these important rain
forests may disappear.

a clue
a title
a date
an abbreviation

4. multiple crosses were made between true-breeding lines of black and yellow labrador retrievers. all the f1 progeny were black. when these progeny were intercrossed, they produced an f2 consisting of 91 black, 39 yellow and 30 chocolate. a. propose an explanation for the inheritance of coat color in labradors. b. propose a biochemical pathway for coat color determination and indicate how the relevant genes control coat coloration.