What contributions did Darwin, Lamarck, Lyell, Malthus, Mendel, and Wallace provide to the development of the scientific theory of evolution?

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? )

How can an organ, such as the lungs, work for multiple body systems?

The pelican's beak is adapted for in .