What is the large dome-shaped muscle under your lungs that you breathe?

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.

What nursing actions are part of the acute respiratory distress syndrome clinical network (ardsnet) protocol?

Which major eukaryotic lineages form the bikonta, a monophyletic group characterized by two flagella as a synapomorphy?