A collection of air or gas in the pleural cavity, resulting in a collapsed lung, describes a condition called a. emphysema. b. bronchiectasis. c. pneumoconiosis. d. pneumothorax.

Body systems are not completely independent they integrate and work together describe one example of the integration between body systems

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.

Contrast how pollination is different among gymnosperms and angiosperms.