SAT Subject Biology Practice Question 316: Answer and Explanation
6. A barren, rocky community near a lake has virtually no vegetation or animal life. After a period of approximately 75 years, the community boasts a wide variety of flora and fauna, including deciduous trees, deer, and raccoon.
Usually the first organisms to colonize rocky areas are lichen. These are known as the
A. primary community
B. starter community
C. colony organisms
D. pioneer organisms
E. settler organisms
Correct Answer: D
D The first organisms to colonize a barren area are known as the pioneer organisms.