[2016] CARLOTA, ESTER & MARINA MAMMALS: Mammal

3.There are main groups of mammals: monotremes, marsupials and placentals. Mammals are grouped to where the embryo develops.

3.1 Monotremes are oviparous. They have a leathery beak and no teeth. Their body is covered with fur. The bebies feed on their mother´s milk.

4.Humans are included in primates, an order of mammals with a placenta.·We have a bipedal position·In humans, the hands have opposable thumbs.·Humans have highly developed brain.We also have a very complex spoken language.We only have hair on some parts of our body.

2.The body is covered with hair .This allows mammals to mantain body temperature and provides camouflage.They have mammary glands that produces milk for feeding young after birth.Their limbs have the same anatomical pattern, but they are adapted to the enviroment they live and move in.The feeding habits of mammals are very varied ; they are carnivores, herbivores, omnivores or isectivores. They have teeth for tearing, cutting and griding their food.They all breathe with lungs.They use sexual reproduction with internal fertilisation.

MAMMAL

An elephant with her baby.

It is a mammal running

HUMANS: CHARACTERISTICS

1. MAMMALS are endiothermic vertebrates. Many mammals live on land but some others are aquatic and some groups are adapted for flight.

3.3Marsupials are viviparous. The babies are not fully developed when born. They need to complete their development in a external pouch called a marsupium, that the mother has.

3.2Placentals are viviparous. The babies are born at an advance stage of their development. In the uterus, they feed through an organ called the placenta.

A monotreme

A placental

A marsupial

BY:MARINA GIMÉNEZESTER RODRIGUEZCARLOTA MARZO