An axon is a. a layer of fatty tissue that encases the fibers of many neurons. b. the extension of a neuron that carries messages away from the cell body. c. a molecule that blocks neurotransmitter receptor sites. d. a cell that serves as the basic building block of the nervous system.

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

How did the discovery of the rhesus factor affect society? o more patients died from having a transfusion with the wrong rhesus factor 0 new treatments during pregnancy could prevent harm to the developing child. o less donated blood could be used in the treatment of patients. the number of blood types was reduced by half

Which of the following typically characterizes a tropical rainforests