A chronic cough, blood-tinged sputum, and dyspnea are symptoms of which cancer? O A. breast
OB. leukemia
C. skin
D. lung

According to the cladogram, which organisms have roundworms as a common ancestor?

The most famous fossil called archaeopteryx is which of the following? a dinosaur a fern a fish a bird

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems