HOW LIFE BEGAN ON THE EARTH
鍦扮悆涓婄敓鍛界殑璧锋簮
No one knows exactly how the earth began, as it happened so long ago. However, according
to
a
widely
accepted
theory,
the
universe
began
with
a
"Big
Bang"
that
threw
matter
in
all
directions.After that, atoms began to form and combine to create stars and other bodies.
娌℃湁浜虹‘鍒囩煡閬撳湴鐞冩槸鎬庝箞鏍峰紑濮嬪舰鎴愮殑锛?/p>
鍥犱负鍦ㄥ緢鏃╁緢鍦ㄤ互鍓嶅湴鐞冨氨褰㈡垚浜嗐�?/p>
鐒惰�岋紝
涓�绉?/p>
鏅亶涓轰汉浠墍鎺ュ彈鐨勭悊璁烘槸锛氬畤瀹欒捣婧愪簬涓�娆″ぇ鐖嗙偢锛岃繖娆″ぇ鐖嗙偢灏嗙墿璐ㄦ姇灏勫埌鍥涢潰鍏柟銆?/p>
鐒跺悗锛屽師瀛愬紑濮嬪舰鎴愬苟缁撳悎鎴愭亽鏄熷拰鍏朵粬澶╀綋銆?/p>
For several billion years after the "Big Bang", the earth was still just a cloud of dust. What it
was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into
a solid globe. The earth became so violent that it was not clear whether the shape would last or not.
It exploded loudly with fire and rock. They were in time to produce carbon, nitrogen, water vapour
and other gases, which were to make the earths atmosphere. What is even more important is that
as the earth cooled down, water began to appear on its surface.
澶х垎鐐稿悗濂藉嚑鍗佷嚎骞磋繃鍘讳簡锛屼絾
鍦扮悆杩樺彧鏄竴鍥㈠皹鍩冦�傞殢鍚庡畠浼氬彉鎴愪粈涔堟病浜鸿兘鐭ラ亾锛岀洿鍒?/p>
38-45
浜垮勾鍓嶏紝杩欏洟灏樺焹鎵嶆參
鎱㈠湴褰㈡垚涓�涓洟浣撶殑鐞冪姸鐗┿�?/p>
鍦扮悆寮�濮嬪彉寰楁縺鐑堝姩鑽★紝
涓嶇煡閬撹繖涓浐浣撳舰鐘舵槸鍚︿細缁х画瀛樹笅
鍘汇�傚畠鐚涚儓鍦扮垎鐐稿柗鍑轰簡鐑堢伀涓庡博鐭筹紝鏈�缁堜骇鐢熶簡纰筹紝姘皵锛屾按钂告皵鍜屽叾浠栧绉嶆皵浣擄紝浠庤�?/p>
褰㈡垚浜嗗湴鐞冪殑澶ф皵灞傘�傛洿涓洪噸瑕佺殑鏄紝鍦扮悆鍐峰嵈浜嗕笅鏉ワ紝鍦扮悆鐨勮〃闈㈠氨寮�濮嬪嚭鐜颁簡姘淬�?/p>
Water had also appeared on other planets like Mars but, unlike the earth, it had disappeared
later. It was not immediately obvious that water was to be fundamental to the development of life.
What many scientists believe is that the continued presence of water allowed the earth to dissolve
harmful gases and acids into the oceans and seas. This produced a chain reaction, which made it
possible for life to develop.
鍦ㄧ伀鏄熻繖浜涘叾浠栬鏄熶笂閮藉嚭鐜颁簡姘达紝
浣嗗拰鍦扮悆涓嶅悓鐨勬槸锛?/p>
杩欎簺姘村悗
鏉ラ兘娑堝け浜嗐�傛按瀵逛簬鐢熷懡鐨勫彂灞曚細璧峰叧閿綔鐢紝杩欎竴鐐瑰湪褰撴椂骞朵笉鏄庢樉銆傚緢澶氱瀛﹀鐩镐俊锛?/p>
鐢变簬鍦扮悆涓婇暱鏈熸湁姘村瓨鍦紝
浣垮緱鍦扮悆寰椾互鎶婃湁瀹虫皵浣撳拰閰告�х墿璐ㄦ憾瑙ｅ湪娴锋磱閲屻�?/p>
杩欏氨浜х敓浜?/p>
涓�绯诲垪鐨勫弽搴旓紝浣垮緱鐢熷懡灏辨湁鍙兘寮�濮嬪彂灞曚簡銆?/p>
Many millions of years later, the first extremely small plants began to appear on the surface
of the water. They multiplied and filled the oceans and seas with oxygen, which encouraged the
later development of early shellfish and all sorts of fish. Next, green plants began to grow on land.
They were followed in time by land animals. Some were insects. Others, called amphibians, were
able
to
live
on
land
as
well
as
in
the
water.
Later
when
the
plants
grew
into
forests,
reptiles
appeared for the first time. They produced young enerally by laying eggs. After that, some huge
animals, called dinosaurs, developed. They laid eggs too and existed on the earth for more than
140
million
years.
However,65
million
years
ago
the
age
of
the
dinosaurs
ended.
Why
they
suddenly
disappeared
still
remains
a
mystery.
This
disappearance
made
possible
the
rise
of
mammals on the earth. These animals were different from all life forms in the past, because they
gave birth to young baby animals and produced milk to feed them.
濂藉嚑鐧句竾骞村悗锛?/p>
姘寸殑琛ㄩ潰寮�濮嬪嚭鐜颁簡鏋佸皬鐨勬鐗┿�?/p>
浠栦滑绻佹畺璧锋潵灏变娇寰楁棭鏈熺殑娴锋磱鍏呮弧浜嗘哀