Mutualism- in which two different organisms interact, and each organism benefits each other (think "positive, positive"; or " +,+ ").
An example would be Oxpeckers and zebras or rhinos - In this relationship, the oxpecker (a bird) lives on the zebra or rhino, sustaining itself by eating all of the bugs and parasites on the animal.
The bird benefits by having a readily available source of food.
The zebra or rhino benefits from having the bugs removed. Also, when there is a danger to the zebra or the rhino, the oxpecker flies high and makes much noise in order to alert nearby animals to the impending danger (i.e. a predator).
Read more at http://examples.yourdictionary.com/mutualism-examples.html#3LtWEwmHBJ53KFbb.99
<span>Unlike identical twins, fraternal twins result from two eggs fertilized by different sperms. This is why fraternal twins are also named dizygotic twins, as there were two zygots at one point. These twins are not identical, although they are born at the same time. They may resemble each other, like any siblings do, but they do not look the same, even though they are technically twins. </span>
I think the correct answer from the choices listed above is option A. The <span>geographic feature that is responsible for helping bring humans and dogs to North America would be the </span><span> Bering Sea land bridge. Hope this answers the question. Have a nice day.</span>
Answer: Viruses
Explanation:
Viruses are tiny infectious agents that rely on living cells to multiply. They may use an animal, plant, or bacteria host to survive and reproduce.