If the Oxygen supply in the atmosphere was replenished by plants it would soon be exhausted .

Nomadic hunter and gatherer societies have access to only a limited amount of food in an area and moved on when they have exhausted each localy.

Diane Arbus’s unusual and controversial work includes photographs of sixties celebriy

Isle Royale National Park in Lake Superior can only be reached the boat .

Before dinosaurs became extinct, plant life is very different on Earth

With its strong claws and many protruding tooth, a gopher is excellent digger.

An electromagnet will remain magnetized only as longer as electricity flow through it

The bodies of cold-blooded animals have same temperature their surroundings, but those warm-blooded animals do not.

“That’s a nice dress you are wearing” – “_______”

Patrick was very late getting home last night, and unfortunately, the dog barking woke everybody up 

………………all the papers, Sarah put them back in the file. 

From archeological evidences, we know that Egyptians were highly organized and civilized. Moreover, they were skillfully in using crafts.

New uses plastics were found during the 1950’s and 1960’s medicine, space, research, industrial , and architecture

As (pure white sugar, Dextrose used (mainly in candy, baked goods, and canned goods.

At the station, we often see the sign "  .......... for pickpockets".

President Wilson had hoped that World War I be last great war, but only two decades later, the Second World War was erupting.

Each of the luxury cars in the showroom wasquickly sold their new owner.

Visits to the zoo is a delightful to any child.

Depending on many factors, including climate,neral content of the soil, and permanency of surface water, wetlands may be mossy, grassy, or covering with shrubs.

On February 20th, 1962, “Friendship 7” orbiting the Earth in a manned flight that lasted just unde five hours

Monkeys use their foot to eat food, to gesture, and to climb.