Why is it important that the trachea is reinforced with cartilaginous rings? what is the advantage of the fact that the rings are incomplete posteriorly?

Consider the diagram below, which represents components of the biosphere. what do the two arrows in the diagram most likely represent? a. radiation b. photosynthesis c. cellular respiration d. energy conversions will give to anyone who answers quickly

What does it mean for a cell membrane to be selectively permable

What is the difference between bacterial infections and viral infections?