1.Life on land probably began about 430million years ago,thought it had existed in the water for perhaps as long as 3,000million years.When we think of the first life on land,we probably think of strange animals coming out of the oceans,but,in fact,no animals could have been living if...
Life on land probably began about 430 million years ago, though it has existed in the water for perhaps as much as 3,000 million years. When we think of the first thing on land, we probably think of strange animals coming out of the oceans, but in fact no animals could have been liv...
Conditions on Early Earth If you took a trip back in time to when the Earth was forming about 4.6 billion years ago, you'd find a very different planet than the one we know and love today. The Earth likely began as a mass of hot, molten material that was constantly being bombarded by...
1.I’ll find a way to improve on my own so that I can make the team next-year.(so that引导目的状语从句)我会找到方法来自我提高以便于明年加入足球队。 2.I’m a bit worried about keeping up with the other students in my advanced course, and it’ll be quite difficult to get used to...
swoon. As We worked on; but the water increasing in the hold, it was apparent that the ship would founder; and though the storm began to abate a little, yet it was not possible she could swim till we might run into any port; so the master continued firing guns for help; and a ...
Prebiotic systems chemistry suggests that high phosphate concentrations were necessary to synthesise molecular building blocks and sustain primitive cellular systems. However, current understanding of mineral solubility predicts negligible phosphate conc
In 2004, as the village started to develop tourism, He Jielin began to raise horses and cattle, founded home inns, and gradually, his living condition was improved. In June 2020, He Jielin renovated his old residence, turning it into the village's first museum on Naxi ethnic culture. Tou...
It is a word usually used to talk about certain animals such as birds, fish and so on. When animals migrate, they travel a long way from one part of the world to another according to the season. For example, swallows (燕子) migrate south in winter. Many animals migrate—they do this...
6.HOW LIFE BEGAN ON THE EARTH No one knows exactly how the earth began,as it happened so long ago.However,according to a (76)widelyaccepted theory,the universe began with a"Big Bang"that threw matter in all (77)directions.After that,atoms began to form and combine to create stars and...
Life began in the ocean(海洋). They are home to about two million species(物种), from the largest animal that has ever lived on the Earth to the smallest one. New species are found all the time, as scientists say that 91%of ocean species have yet to be found or described. ...