Passage 1:In marine habitats, a number of small creatures are involved in a "cleaning symbiosis." At least six species of small shrimp, frequently brightly colored, crawl over fish, picking off parasites and cleaning injured areas. This is not an accidental occurrence, because fish are observed to congregate around these shrimp and stay motionless while being inspected. Several species of small fish (wrasses) are also cleaners, nearly all of them having appropriate adaptations such as long snouts, tweezers-like teeth, and bright coloration. Conspicuous coloration probably communicates that these animals are not prey.

Section 1 (scan and skim):
This passage is mainly about
a. A process of marine life
b. A place in the sea
c. A species of marine life
d. A mystery of marine life

2. The habitat described in this passage is
a. An aquarium
b. An island
c. The ocean
d. A laboratory

3. The "c