Similarities in the bones of the human arm and a whale's flipper suggest what about these organisms?
a.) they have the same dna.
b.) they have nothing in common.
c.) they share a common ancestor.
d.) whales evolved from humans.

Aneuron is stimulated with an electric pulse. the action potential is detected at a point 3.70 cm down the axon 0.0052 s later. when the action potential is detected 7.20 cm from the point of stimulation, the time required is 0.0063 s. what is the speed of the electric pulse along the axon? (why are two measurements needed instead of only one? )

Which geologic feature would most likely be represented by contour lines john far apart from one another? a cliff a hill a plain a valley

Drag the correct tiles to the image. not all tiles will be used. the diagram is a schematic representation of the electron transport mechanism in mitochondria. label the diagram to complete the model.