16. Type I alveolar cells a. None of the statements is true b. Secrete a chemical known as surfactant c. Allow rapid diffusion of gases through their thin membranes d. Are phagocytic e. Allow rapid diffusion of gases through their thin membranes, secrete a chemical known as surfactant, and are phagocytic

How many variables are altered in a good experiment? a.1 b.0 c.2 d.3

Hemoglobin is the compound in red blood cells that carries oxygen to the body. the distribution of hemoglobin in women in g/dl of blood is approximately normally distributed with mean 14 and standard deviation 1. too little hemoglobin, and you're anemic. 2. too much, and (unless you live at high altitudes), you can have other problems.

Astudent drew the following flowchart to show the movement of nutrients. soil → roots → plants →? where does nitrogen go next? a. directly into nearby animals as nutrition b. directly into aquifers through condensation c. directly into the air through evaporation d. directly into nearby plants during fixation