The reason coral reefs are among the most productive and successful ecosystems is due to ________.
A. the coral-dinoflagellate mutualistic relationship
B. commensalisms
C. the lichen mutualistic relationship
D. All of the choices are correct.
Answer: A
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The thin delicate membrane just attached to the cytoplasm
a. Ectoplasm b. Endoplasm c. Tonoplast d. Protoplasm
The first heart sound (lub) is produced by the closing of the ____ and ____ valves
a. aortic semilunar; pulmonary semilunar b. right atrioventricular; aortic semilunar c. left atrioventricular; pulmonary semilunar d. right atrioventricular; left atrioventricular e. mitral; left atrioventricular
These small short-lived organisms have a reproductive strategy to produce many offspring that have fluctuating populations.
A. r-strategists B. k-strategists C. l-strategists D. s-strategists
Which of the following is false about the tropical disease African sleeping sickness?
A) It is carried by a blood-sucking mosquito from host to host. B) It induces an immune system reaction so strong that host neutrophils can harm host neurons. C) If the disease goes untreated, it is fatal. D) Those infected cannot sleep at night and cannot stay awake during the day. E) It is caused by the flagellated protozoan Trypanosoma brucei.