第1个回答 2020-03-08
hello,Martians,welcome to the earth,it is my honour to make a simple introdction of our planet.
this planet is made up of ocean,land and outer space,from which humans get resources and live on.
There
are thoundsands of creatures living in the ocean,they lead their lives a
little different with humans,they are swimming but not walking like
humans.they are not breathing in the air but get oxygen from water.
There
are also thousands of creatures on the land,like
animals,plants,etc..human is one kind of animals,some Animals like human
may achieve energy from food like vegetable,fruit or flesh,some only
eat plant,and some only eat flesh.the animals all achieve oxygen from
air,some walk by two legs,some walk by four.plants can not walk,and
breath CO2,they produce xoxygen and submit into the air.
welcome to earth,you may enjoy yourself to have a free trip本回答被网友采纳