Ionic and Covalent bonds
Ionic bonds : Is a chemical bond between a metal and a non-metal and an electron Transfer takes place.
Covalent bonds: A chemical bond between two non-metals and an electron
Sharing takes place.
The correct option is this: TWO DRAGONFLY SPECIES REGULARLY MATE BUT THEIR GAMETES ARE INCOMPATIBLE.
In biology, there are different types of reproductive barriers, one of these is prezygotic barrier. A prezygotic barrier is a kind of mechanism that prevent reproduction from occurring by blocking fertilization. In this case, the concerned species will be mating together, but their gametes will not be compatible and thus, zygote will not be formed.
A postzygotic barrier on the other hand is said to occur when the reproduction process is blocked after the formation of zygote or after fertilization has taken place. A good example of this is an hybrid mule that is sterile and can not reproduce.
The answer is B because men only have one X chromosome. Their chromosomes are xy.
Explanation:
Aluminium is a metal from group 13. ... The acids in the pickle would react with aluminium forming hydrogen gas in excess. This will deteriorate the quality and taste of the pickle and would also harm the human body if consumed.
