Diffusion of oxygen and carbon dioxide across cell membranes occurs most during select one: a. ventilation b. internal respiration c. movement of air from the nose to the nasal cavity d. both a and b

If someone could do the first couple, just so i can see how it's done that would be great! 20 points. complete a dichotomous key for the 10 leaves on the common leaves sheet. the chart provided here allows for 11 pairs of statements. depending on how you build your dichotomous key, you may or may not need all of them, or you may need to add some.

Does all the energy stored by the phytoplankton reach the top level of the pyramid

Read the following statements that describe how information flows in the nervous system. what is the correct order in which they occur? 1) response is carried to glands or muscles. 2) information is gathered. 3) information is processed and a response is formed.