Why Mammals with a high rate of respiration need to have a high heart rate.

Why Mammals with a high rate of respiration need to have a high heart rate. What mammals are very important to humans?Why?用英文答 so why mess with a good so why mess with a good Why not sing a song with me,.的同义句 do you like a job with high salary?why? do you like a job with high salary?why? 翻译:Dolphins are mammals,not fish,but they swim together in a school 1It is never harmful ___ you to be polite and gentle to others and___,as is often the cased,you can get what you want.A to;thus Bfor,thus;Cof;therefore Dwith;however2It still puzzles the sceince world why some mammals produce their young____ and hatc why not be with my uncle buys a big h------- with a garden. 来做几道英语选择题．说明理由1.but man and some monkeys are the only mammals ( )can see colorA.which B.who C.when D.that2.like ( ) animals ,dogs seebest when things moveA.for B.with C.as D.to3.the animals they hunt seem to know( ) .A.the whales aren't____,they are mammals(哺乳动物）A.fish B.fishes请说一下原因``谢勒哈 write question.begin with the words in brackets.1.the girl was included in the team.(why) 2.he was advised to continue.(why) 3.she was helped by her teacher.(how) 4.the boys were photographed by the coach.(when) 2.he was sent to a special school by h What parts of a body begin withh?翻译 what parts of a body begin with h? do you like developing friendship or love with a pal?why or why not?是 pal 不是那个key pal 15.Do you like developing friendship or love with a key pal(网友)?Why or why not?