How many kinds of animals live on the Earth?A recent survey shows that scientists have found more than 2 million kinds of animals and there are over 10 million we haven't discovered yet.Animals are much more than food or pets for humans.Animals are smart.Some of them do very unusual thi...
Though taxonomists have been cataloguing plants and animals for more than 250 years, they still have no exact answer to the question, “How many species are on Earth?”“It’s a very simple question, but we have no simple answer,” Fisher said. One of the reasons we can’t get an...
Earthquakes may take place anywhere on the earths surface. During all earth quake, the vibrations make the earths surface tremble, and even crack open. Houses fall, people are lilled or injured and sometimes whole cities are destroyed. Can we do something to protect ourselves against earthquakes?
there are many kinds of animals in the world,but not only the humans.we live in the same world,and we should be friends.as everybody knows, the humans are the rulers of the world today,so we should protect our friends--the animals!but how to protect them? as first,i think we must...
So every night, out in the middle of the desert, Afel now practises skiing down sand hills. He 29that the yellow sand and brown earth are as gold as the medal he will bring home with him, when he is the 30. 11.A.drawing B.playing ...
But many weigh up to 300 pounds because of overfeeding. Pigs are some of the cleanest animals on the earth. They can learn to use a little like a cat. Many live in houses and apartments. But they can get in the way. Pigs have a good sense of smell. They help find truffles(...
19. People have used solar energy for many years. They build houses with windows so that the sunlight ___ get inside and make them warm. 此处表示“能够”,应该用can。 20. There ___ solar panels that collect energy from sunlight to make electricity. There be句型中,be动词的单复数形式取决...
Like other species, we are the products of millions of years of adaptation. Now we're taking matters into our own hands.
Study Solves Mystery of How First Animals Appeared on EarthResearch led by the Australian National University has solved the mystery of how the first animals appeared on Earth, a pivotal moment for the planet without which humans would not exist.Australian National University...
They are good copycats. They imitate other birds. But they can also imitate other animals. They can even make sounds like a piano or car alarm. Mockingbirds learn to sing many songs. Some learn more than 200 different songs. They can often trick people! But mockingbirds can't trick ...