The aromatic oils of chaparral
a. promote wildfires
b. make many plants flavorful cooking herbs
c. shrubs eliminate their competitors
d. all of the above

D all of the above Chaparral shrubs tend to dominate in the lead up to a large cleansing fire. The oils promote wildfires, can be used for cooking and also are deadly to competitors. Thus before a large wildfire typically only certain chaparral shrubs dominate the landscape, and are often partially the cause and the vector of spread for the fire.

Nucleus is the organelle that contains chromosomes