How many trophic levels are there in the following food chain?
algae - mosquito larvae – dragonfly larvae - trout

Imagine ? person stepping on a pin and pulling his or her foot way look at the réfléchir arc of the scenarios below

Suppose you could go back in time to interview henri becquerel on the day he discovered radioactivity. from his perspective, write an account of the discovery.

Membrane vesicles containing an internal sodium chloride (nacl) concentration of 0.14 m are placed into separate beakers each containing a different solution. the first beaker contains 0.14 m sucrose, while the second beaker contains 0.14 m calcium chloride (cacl2). the temperature is 25°c. what is the solute potential inside the vesicles, expressed in units of mpa?