What could you learn by actually crossing two plants that you cannot find out from the Punnett square?

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

Which body region are part of the cephalic region?

Which example best describes a reflex action? a. eating food when hungry b. coughing when the throat is irritated c. bending down to lift a heavy object d. going for a walk outside