We have mammery glands, which is a requirement for being a mammal, but why didn't we come retiles?
2006-07-28 15:14:57 · 19 answers · asked by Gardenfoot 4 in Science & Mathematics ➔ Zoology
-The diagnostic feature of mammals is to have hairs and we have hairs
-mammalian are four footed animals, so we
-Endothermic animals
-amniotic (presence of amnion in early embryonic stages)
**- Why didn't we come reptiles?
-because the reptile's body covered with scales
-exothermic animals
-an amniotic (Absence of amnion in early embryonic stages)
mammalian are viviparous (Giving birth to living offspring that develop within the mother's body), While reptiles oviparous(Producing eggs that hatch outside the body)
reptiles are insectivorous while mammals are omnivorous
eventually we didn't hibernate or aestivate
2006-07-28 23:44:22 · answer #1 · answered by OgaLaN 2 · 2⤊ 1⤋
The 1st mammals evolved from retiles. If people were to become retiles that would mean an impossible amount of backward mutations. That explanation wouldn't be parsimonious and then be violating an important rule of science.
2006-07-29 15:58:48 · answer #2 · answered by Anonymous · 0⤊ 0⤋
We all voted and decided that being a reptile would mean having rough scaly skin and as a people we spend enough on skin care products as it is, and so decided in a 73 - 18 vote (with 9 abstaining) that it would be better to be a mammal.
Oh, and 897, not all reptiles lay eggs. Many snakes are live born. And dumb science teacher below, many reptiles also take care of their young. God you guys are stupid.
2006-07-28 22:22:10 · answer #3 · answered by martin b 4 · 0⤊ 0⤋
Mammals are warm blooded, give birth to live young, feed the young with mammary glands, and have hair. Humans fit into that grouping.
Reptiles are cold blooded, lay eggs, do not have hair,do not take care of their young, in general.
2006-07-28 22:24:13 · answer #4 · answered by science teacher 7 · 0⤊ 0⤋
God probably knew beforehand that we would have way too many outside obligations to spend all of our time sitting on a blasted egg. Imagine asking for a leave of absence from work because you have to sit on an egg. Reptiles (unless they work for car insurance companies) don't have to get up in the morning and go to a public job, so they really have nothing better to do. Besides, God knew that we would be too heavy and clumsy to sit on an egg without breaking it.
2006-07-28 22:26:45 · answer #5 · answered by agordonpym2004 2 · 0⤊ 0⤋
Human offsprings are born alive, not enclosed in egg shells that's why we're mammals. We are not reptiles because they give birth to eggs. Maybe someday people could become reptiles if they want.. >_<
2006-07-28 22:21:18 · answer #6 · answered by Clauds 3 · 0⤊ 0⤋
see we have many characters to secure a chetegory to animals and spieces.to being a mammal we have many requirment like thier should be hairs,ear pinna,mammary glands,corpus calosum,viviparism etc.and you know we have all these characters.that's for human biengs are mammal.
2006-07-29 03:28:09 · answer #7 · answered by ashu 1 · 0⤊ 0⤋
Because we are warm blooded animals, and I think it also has to do with having hair also. I can't remember if that is all or not, I hope I could be of some help.
2006-07-28 22:20:05 · answer #8 · answered by tre_loc_dogg2000 4 · 0⤊ 0⤋
Intrauterine life ensures safety. The newborn gets nutrition from milk.Long gestation period ensures optimum development.Eggs can be stolen and misplaced, and even eaten.
2006-07-29 00:21:51 · answer #9 · answered by nkmy83@yahoo.com 3 · 0⤊ 0⤋
we have hair and females give live birth .... both requirements for being a mammal
2006-07-28 22:19:43 · answer #10 · answered by recklessabandon1433 3 · 0⤊ 0⤋