The experiments nevertheless showed that fertilization between two different species was not possible, because of the specificity of the carbohydrate moiety ZP3 glycoprotein (specific for a given species, the protein part being very conserved during the evolution) involved in the fertilization process. This specific recognition mechanism is especially useful for animals with external fertilization, as some fish or amphibians: the female lays her eggs in the middle, and the male comes to deposit his sperm.
During a drought, there is less water available for the plants. There is less runoff and less infiltration. During a drought, less water is returned to the atmosphere by the plants through transpiration, and there is a decrease in the plants' rate of photosynthesis.
