Which is the first type of cell to differentiate?
neuron
epithelial cell
muscle cell
blood cell

Diagram of the evolution of land plants?

According the inverse square law, doubling the distance from the source of the sound, a speaker, for example, will drop the sound 6 db each time. if you were standing in the back of an auditorium, 32 feet away from a speaker not using any amplification, would you be able to hear a speaker clearly? why or why not?

Why are common names a problem for scientist?