(1) In 1994, three explorers set out to investigate the caves of southern France. (2) When they came across a cave opening that were blocked by stones, the explorers removed the stones and entered it. (3) Inside, the explorers found hundreds of paintings done on the rock walls. (4) Little did they know, they were looking at one of the oldest art displays in the world. (5) Initially, the explorers assumed the paintings were not very old. (6) Scientists were later brought in to take samples of the rock inside the cave. (7) They used radiocarbon dating to guess the age of the paintings. (8) Based on the scientists findings, the paintings were estimated to be as old as 30,000 B. C.E.!
(9) Since its discovery, the Chauvet Cave has fascinated everyone from geologists to art historians. (10) What sets the Chauvet Cave apart from other caves is the fact that it is unusually well preserved. (11) Scientists believe that a landslide sealed the entrance to the cave around 25,000 years ago. (12) Because the cave had no exposure to air, water, or living things its paintings and drawings remained intact.
4
What change, if any, should be made in sentence 12?
A.
Remove the comma after the word air.
B.
Add a comma after the word things.
C.
Insert a hyphen between living things.
D.
Change the word its to it's.

In the world state, children are encouraged to engage in erotic play. in our society, they are discouraged. why is the world state society different?

Which three parts of this passage from chapter 6 of emily brontë's wuthering heights show that hindley earnshaw did not care about the well-being of catherine and heathcliff after the death of mr. earnshaw? they both promised fair to grow up as rude as savages; the young master being entirely negligent how they behaved, and what they did, so they kept clear of him. he would not even have seen after their going to church on sundays, only joseph and the curate reprimanded his carelessness when they absented themselves; and that reminded him to order heathcliff a flogging, and catherine a fast from dinner or supper. but it was one of their chief amusements to run away to the moors in the morning and remain there all day, and the after punishment grew a mere thing to laugh at. the curate might set as many chapters as he for catherine to get by heart, and joseph might thrash heathcliff till his arm ached; they forgot everything the minute they were together again: at least the minute they had contrived some naughty plan of revenge; and many a time i’ve cried to myself to watch them growing more reckless daily, and i not daring to speak a syllable, for fear of losing the small power i still retained over the unfriended creatures. one sunday evening, it chanced that they were banished from the sitting-room, for making a noise, or a light offence of the kind; and when i went to call them to supper, i could discover them nowhere. we searched the house, above and below, and the yard and stables; they were invisible: and, at last, hindley in a passion told us to bolt the doors, and swore nobody should let them in that night. the household went to bed; and i, too, anxious to lie down, opened my lattice and put my head out to hearken, though it rained: determined to admit them in spite of the prohibition, should they return.

What are the benefits of secondary source