Humans already use fifty-four percent of all the fresh water in rivers, lakes and underground. There are some{{U}} (36) {{/U}}that this rate will reach seventy percent by 2025. Fresh water is necessary for life on Earth. People need water for everyday activities and to{{U}} (37)...
But what came before apes Chinese scientists have discovered fossils that could enrich the evolutionary story of how humans evolved from fish.According to four articles published in the journal Nature in late September, Chinese researchers found fish fossils that provide the “missing link” about ...
Like other species, we are the products of millions of years of adaptation. Now we're taking matters into our own hands.
1. What does Para.1 mainly tell us? A. Water is always the most important in our school lives. B. Saving water can help us better improve the environment. C. People in different places have different habits to use water. D. People around the world are facing serious water problems. 2...
All living things on the Earth need water to live. Yet humans are facing serious water problems. According to the United Nations,today over 663 million people live without a safe water supply close to home.To remind people of the importance of water, the UN first set up World Water Day ...
All living things on Earth need water to live. Yet humans are facing serious water problems. According to the United Nations, today over 663 million people live without a safe water supply close to home.To remind people of the importance of water, the UN first set up World Water Day in ...
countrythat are built in the last few years have rainwater collection devices(设备).Rainwater is collected from the roof(房顶), and then linked to the toilet.But if you don't have the device, just put a bucket(桶) under your roof whenit rains.Water makes up 71 percent of Earth's ...
Humans are one of the main reasons for this. According to a report by the United Nations in 2019, the world’s population has doubled (from 3. 7 to 7. 6 billion) in the past 50 years. Humans have used more than one third of the world’s land and 75 percent of freshwater. Beside...
Seventy percent of its DNA is the same as human DN B. Sabanayagam is a scientist, who built a micro-gravity simulator to test how C. elegans would perform in the actual zero gravity of space. Scientists put the worms into the simiulator full of water. After a week they take out the...
Much less than one percent of the earth's water can be used by humans.Areas that need a lot of water often have to bring it in from far away.For example,southern and central California get most of their water from northern California.The Middle East and Mexico are among the places where...