In mammals, air enters lungs through tubes called, which branch into smaller tubules called, which extend out to tiny air sacs called. trachea; bronchioles; spongy tissue. bronchi; bronchioles; alveoli. bronchi; alveoli; gills.

Which statement best explains how the number of mitochondria in a cell relates to the specialization of a cell? A. Muscle cells are easily destroyed. Since mitochondria are protein factories, they aid in the rebuilding of muscle cells. B.

Why does sexual reproduction increases the genetic variation in a species

What is the author's tone in this tine from William Dean Howells's "Editha"? The E hether said in his public-will-now-address-a-few remarks to New York ... "My name is Balcom, ma'am: Junius Balcom. Balcome A. angry B. solemn C. sarcastic D.

When comparing height/weight tables, BMI, and body composition, which is most accurate for determining ideal weight?

Guanine, cytosine, thymine and __ are the four __ in dna

Which example best describes one way that humans contribute to the water cycle? A. formation of genetic material B. evaporation of sweat from skin C. production of oxygen D. fixation of nitrogen into ammonia

How would signaling be affected if a mutation caused a g protein to replace gdp with gtp on its own without needing to be activated by the g protein-coupled receptor?

The role of an organism in the ecosystem is called its A. niche B. habitat C. species D. environment

Which condition will increase the rate of chemical reaction?

Why does DNA has an overall negative charge?