What two things must happen for diffusion to occur?

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

(drag each tile to the correct location.) categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. - a tentative statement used to guide scientific investigations. - makes predictions about future events. - can be tested by many independent researchers. - based on observations of natural phenomena. - a well-established, highly reliable explanation.

When listening the levels of orginization in orginisims from the smallest to most complex , which level is just below organs in complexity