They are genetically and reproductively isolated. For the mule the specific isolation mechanism is termed as "Hybrid Inviability", where the postzygotic isolating mechanism prevents the hybrid from passing on their genes. A zygote may form with the sperm and egg, but the embryo will dies after a few cell divisions. The genetic information from male and female parents is insufficient to carry the organism through morphogenesis. *There are rare documented cases of a mule producing a viable offspring.
Evaporation
Explanation:
On a hot sunny day, the stage of water cycle most likely occurring is the evaporation stage.
At this stage, a phase change is occurring and liquid water is converted to water vapor in the atmosphere.
- Evaporation is an important aspect of the water cycle.
- It is preceded by precipitation and followed by condensation in the atmosphere.
- Water rises from the surface in gaseous forms and condenses in the atmosphere.
- This is because it is less dense than the surrounding atmosphere.
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Explanation:
Carbon cycle - It is defined as the process in which the carbon moves form the atmosphere into the living organism and the Earth and then back to the atmosphere. For example plants take carbon dioxide to prepare the food. Animals eat the plants and then carbon dioxide is stored in them or released in the form of carbon dioxide in the atmosphere.
Nitrogen cycle - It is defined as the process in which nitrogen is converted into different chemical forms as it circulates among terrestrial and marine ecosystem and the atmosphere. For example nitrogen present in the soil are absorbed by the plants through its roots which comes in the form of ions. Nitrogen is reduced to nitrite ions, when absorbed the plants. Further it becomes ammonium ions which can be incorporated into amino or nucleic acid.
Hydrological cycle - It is defined as the continuous movement of water below, above and on the earth. For example water at the Earth's surface evaporates into the atmosphere. Moisture moves around the earth with weather pattern, and rain and snow condenses from it.
