Yes, calcium carbonate is a hygroscopic compound.

Yes, you can use a refrigerated perm.

Solar System is the Sun and those celestial objects bound to it by gravity, all of which formed from the collapse of a giant molecular cloud approximately 4.6 billion years ago. Source:en.wikipedia.org

Holes in the ground made by an animal for shelter

It can attract the consumer's attention and sell more goods.

It can bring the seed of some plant to other place by wind.

After having used the memos a long time ,the people may depend on the memos to remember something,but not their memory

Management Information System

By photography,people can chalk up the wonderful moments of life and can also conserve the history for offspring.

You can find the chords for lyre in a shop selling instruments.