Some species disappeared or became ______ as new forms came into being that were better ad

？？DDuring the Crimean War in l854 many soldiers were wounded or became ill．News reached En

Some species of animals have become extinct because they could not ______ to the environme

The following are endangered species EXCEPTA．tigers.B．whales.C．polar bears.D．some types of

Among almost seven hundred species of bamboo, some are fully grown at less than a foot hig

Some conservationists fear that many endangered species will not be valued because ______.

Many people feel that human beings should be responsible for the disappearance of some ot