Which action is a reflex action? asking for coffee in a cold climate blinking when light is flashed in the eyes drinking water when thirsty swallowing food taking an exam

The correct answer is blinking when light is flashed in the eyes

The blinking of eyes is considered as the reflex action because it is an involuntary closing of eyelids which is elicited by the stimulation of cornea. Any peripheral response can generate blinking of eyes. The purpose of this reflex action is to protect the eyes from foreign stimulus. When a light is flashed on the eyes it served as an external stimulus, as a result of this the eyes blinked to protect the eyes from bright light. It occurs in 0.1 seconds.

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.