The mechanisms of reproductive isolation prevent the reproduction of two individuals from different species. The prezygotic mechanisms disrupt the stages of reproduction before the forming of the zygote or prevent the mating at the start, and the postzygotic mechanisms affect the stages of reproduction after the forming of the zygote.
So, the first and the third example (the urchins and the grasshoppers) show the prezygotic mechanism, as the two individuals are not able to mate or form a zygote.
The second and the fourth example ( zonkey and the death of a zygote) show the working of the postzygotic mechanisms, as the zygote is formed, but it seems to be inviable, and the zonkeys are sterile, preventing the individual to reproduce.
Answer:
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Answer:
Ocean circulation patterns is directly linked with the marine ecosystem. El Nino event hinders the climate interaction of ocean.
Explanation:
- The disturbance in the ocean climate interaction transfers the essential nutrients into the deep down ocean leaving very tiny amount at the surface. It lacks the support to plankton growth.
- Ocean circulation patterns can sometime make the ocean food ecosystem less productive.
- El Nino event reverses the ocean current. Surface waters in the central and eastern Pacific Ocean become significantly warmer than usual during this event. So the drifting starts towards east direction (normally driven west).
The endoplasmic reticulum is an organelle that is responsible for the synthesis of lipids and the modification of proteins.
The preservation technique that
attempts to remove moisture is dehydration or drying of foods. Many types of
food such as meat, fish are preserved for an unlimited period by removing the
moisture. This way, the growth of microorganisms in the food is hindered. Dehydration
is one of the oldest methods of food preservation. Equipment such as cabinet driers
and vacuum driers are used in dehydration.
