Which statement best describes the germ theory of disease? diseases are caused by bad-smelling poisonous vapors that contain decaying matter. diseases are created or generated spontaneously within the body. diseases can be isolated and grown in cultures. diseases are caused by the presence and action of specific microorganisms.

 Fourth option is correct.

Explanation:

Germ theory of disease stated that Diseases are caused by the presence and action of specific microorganisms inside the body.

It says that the pathogens are responsible for causing diseases.

These pathogens are too small to see without the use of microscope attacks human, animals and other hosts.

That pathogens caused infection due to which diseases occur in the body.

Hence, Fourth option is correct.

D.

Explanation:

Diseases are caused by the presence and action of specific microorganisms.

chromosomes carry the genetic information for organisms. also, chromatin is the thread like dna which is located in the nucleus of an organism.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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