根据第二段的"Neuroscientists have evidence that sleep plays a central role in the function of the brain.Sleep is involved in clearing metabolic (新陈代谢的) wastes from the brain,contributes to regulating the immune system,and is involved in the changes to the brain that happen during learning...
Humans and animals need oxygen to exist.Without it,most living things will die.But where does oxygen come from?Trees.Trees can take in much carbon dioxide (二氧化碳) which may be bad for our environment and produce oxygen for us to breathe. All people know that trees are important to us....
disease, human interaction, and pesticide usage can decrease in bees up to 80 percent in the world’s specific parts. Thus, it offers things that are far more critical than delicious honey. So, the bees are one
We human beings could not surviveall the plants and animalsus.2. T igers which are danger of dying out, isthe animals that need our help.3 . She turned round and there was an antelopea sad face lookingher.4. T he chair rose again and almostnce they werethick rain forest.5.a ...
Everyone may know that animals do better in some things than our human beings.Scientists search the reasons.At last they think that one of the skills which many animals have is homing instinct(本能).These animals such as pigeons,bees,salmons,frogs and cats are able to find their way home,...
Trees.Trees can take in much carbon dioxide (二氧化碳)which may be bad for our environment and produce oxygen for us to breathe.All people know that trees are important to us.Scientists believe human life would be impossible if there were no trees on the Earth.Trees are a major source (...
Animals are more than just resources of things we need. Every kind of animal has its place in the balance of nature. Destroying any kind of animal can lead to many problems. For example when farmers killed large numbers of hawks the corn and grain that the farmers stored were destroyed by...
There are approximately 2,270 sea animals covered under the U.S. Endangered Species Act. Get to know 20 of the most fascinating ones—plus how you can help them.
Humans and animals need oxygen to exist. Without it, most living things will die. But where does oxygen come from? Trees.Trees can take in much carbon dioxide (二氧化碳) which may be bad for our environment and produce oxygen for us to breathe.All people know that trees are important to...
C.Can they also help human? D.One important thing that they need to learn is how to follow orders. E.If the owner has dropped something, he or she might say “fetch”. F.Likes dogs, monkeys need lots of training to be human helpers. ...