Answer:
The four selections use different media to present information about effects of human activities on the environment. There are advantages and disadvantages to each medium. For example, the photographs and diagrams in "A Natural Balance"
It would be the first one (I've had experience with that first hand)
You can put the question like this 2.5 divided by .25 which equals 10
-Jonas calmed Gabriel by putting his hand on his back and accidentally giving him memories of sailing.
-Jonas decides not to confess because he had yet to confess to the giver that he gave away a memory. :)
In formal english, we use words to say precisely what we mean
