The correct answer is Stimulus.
A thing or an event that provokes a specific functional response in an organ or tissue of an organism is called as stimulus. It can be anything like heat, light, water, chemical et cetera. Any stimulus when encountered by the organism produces response in reference with the stimulus generated by the external environment or other organism.
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What is the reproductive system of reptiles?
Reptiles are almost all sexually dimorphic, and exhibit internal fertilization through the cloaca. The reproductive system of reptiles has four functions:
To produce egg and sperm cells.
To transport and sustain these cells.
To nurture the developing offspring.
To produce hormones.
The loss of the hydrogen on one molecule produces a negative charge, which is attracted to the positive charge formed by the loss of the hydroxy group from the other molecule.
