What are the most potent stimuli for breathing in order of greatest to least?

Which of the following is the correct pathway of lymphatic circulation?

Which muscle group slows down the knee motion in terminal swing and prevents the knee from “snapping” into extension just prior to initial contact?

What is true about the regulation of glomerular filtration rate (GFR)?

A person who lies supine on a table with her hands clasped behind her head and is unable to get her elbows to touch the table (or who lies supine with arms extended overhead and is unable to allow arms to rest on table) is exhibiting tightness of her ___.

CP33 buffers around the perimeter of a crop field must be at least:

Vegetarians claim they are better consumers of food because they eat from the first trophic level (plants) instead of the second trophic level (animals that eat plants). However, because the American vegetarian diet is heavy in milk products and eggs, the difference is very small. Why so?

The crux of the second law of thermodynamics is:

With regard to the pie chart, (not the table) the single largest consumer of energy in modern farming today is:

Which of the following energy sources is poised to increase greatly in the future?