Number the events from earliest (1) to most recent (6) to outline the development of the cell theory.

Anton van Leeuwenhoek observed small organisms he called "animalcules."

Robert Hooke was the first to use the word "cell."

Matthias Schleiden theorized that plants are made of cells.

Theodor Schwann theorized that animals are made of cells.

Hans and Zacharias Janssen created the first microscope.

Rudolf Virchow theorized that cells come from other pre-existing cells.

The chronological order of events ealiest to most recent (1-6) are given below:

Explanation:

1. Hans and Zacharias Janssen created the first microscope in the year 1590.

2. Robert Hooke was the first to use the word "cell." In the year 1665

3. Anton van Leeuwenhoek observed small organisms he called "animalcules." In the year 1674  

4. Matthias Schleiden theorized that plants are made of cells in the year 1838

5. Theodor Schwann theorized that animals are made of cells in the year 1839

6. Rudolf Virchow theorized that cells come from other pre-existing cells in the year 1855

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.  

read more on -