1If unwanted pet turtles are unleashed into the wild, many will die and those which exist will threaten the lives of native plants and animals.
ALike all other mammals, dolphins have lungs.
3 Up to World War II almost
allevery important research in physics had been madedone in universities, with only university funds for support.
4, In the human body, blood flows from
athe heart through the arteries, and it returns through the veins.
5. During the first half of the nineteenth century, immigrants to the United States were
predominantly from Western Europe; after the Civil War, however, new arrivals came
mainly from Eastern and Southern Europe, as well as from Asia.