A. is the answer because they are found in the earths crust because overtime dirt and water covered the fossils
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Answer:
water flows through the landscape. the condition of the land surface affects the flow and quality of water .
Answer:
Trees are important because the provide the paper we need to make money. Trees are apart of plants,and plants provide oxygen for humans to breathe.
Explanation:
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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.
