Which is the characteristic that scientists use to classy plants

The diagram shows a chicken embryo and a human embryo

How can we use spectral lines of light coming from the superclusters to identify which is receding from earth at the slowest rate.

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