Santiago ramon y cajal demonstrated that a. at rest, the neuron has a negative charge inside its membrane b. neurons are separate from one another c. action potentials follow the all-or-none law d. neurons communicate at specialized junctions called synapses

b. neurons are separate from one another

Explanation:

Santiago ramon y cajal was a Spanish histologist who was born in Petilla de Aragón, and graduated from the University of Saragoza, noted for his pioneering studies in the fine structure of the nervous system. He was responsible for researching and discovering that neurons are separate from each other, furthermore, he demonstrated the basic changes of neurons during nervous system functioning. It was also the first to isolate brain nerve cells, called Cajal cells.

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !

the dna of humans and mice is almost 92% similar. this similarity indicates that . mice have a tail, while humans have a tailbone. the tailbone is a structure in humans.yes it's true.