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.
Climate, Land form/shape and fossils(he was most interested in this)
It’s to get all your different bones the right nutrients they need so they do get weak.
Hey! The answer is: Collect data using a prototype.
I have a screenshot attached as well.
I hope this helps you!
Good luck! :)
Answer:
Lipid
Explanation:
lipids are comprised of a glycerol and three fatty acid tails.