Answer:
Monotremes are mammals that lay eggs. The only monotremes that are alive
today are the spiny anteater, or echidna, and the platypus. They live in Australia,
Tasmania, and New Guinea. These mammals are really different from other
mammals. Their body temperature is lower than most warm-blooded animals, a
feature that has more in common with reptiles. Their name comes from the fact
that they have only one body opening for both wastes and eggs to pass through.
Echidnas have sharp spines scattered throughout their hair. They look like a spiky
ball. The female anteater lays usually one leathery-shelled egg directly into the
pouch on her belly. The egg hatches after only ten or eleven days. The newborn
baby is tiny, about the size of a dime. After the baby hatches, it stays in the pouch
for several weeks and continues to develop. Babies are fed by their mother's milk
that seeps out of pores on her skin. When the babies are six to eight weeks old,
they grow spines that begin to irritate the mother anteater. She then scratches the
baby out of her pouch.
The platypus has webbed feet and a bill. Its body is torpedo-shaped and is
covered with soft fur. Platypuses live in the water. They make mazes of tunnels in
muddy banks along lakes, small streams, or rivers. The female lays her eggs in an
underground nest. After they hatch, the tiny babies drink milk from their mother's
body. They feed by lapping up the milk that oozes onto the fur of their mother's
belly. The platypus' duck-like bill is not like a bird's beak. A bird's beak opens to
reveal its mouth. The platypus' bill is a sensory organ with its mouth on the
underside. The platypus is also one of the few mammals that is venomous. The
male platypus has a spur on its hind foot that delivers a poison that is very painful
to humans. It can kill some small animals.
Marsupial mammals give birth to babies that are not completely developed.
The babies are very tiny. The babies then crawl up the fur on the mother's belly
into a pouch on the outside of the mother's abdomen. The babies drink milk from
the mother and continue to develop inside the pouch. Koalas, kangaroos, wallabies,
and opossums are some of the better-known marsupials. Today marsupials are
found mostly in Australia, New Guinea, and South America. The only marsupial in
North America is the opossum. Opossums may give birth to as many as twenty-one
babies at one time. However, the mother only has thirteen nipples in her pouch.
The first thirteen babies to climb into her pouch and attach to her nipples are the
only ones that survive.
A placental mammal develops inside its mother's body until its body systems
can function on their own. The name of this group comes from the placenta, an
organ in pregnant female mammals that passes materials between the mother and
the developing baby. Food and oxygen, carried by blood, pass from the mother to
the baby through the placenta. Wastes pass from the baby to the mother, where
they are eliminated by her body. Most mammals, including humans, are placental
mammals.
Explanation:
for short:
Monotremes Marsupial and placental mammal are the three types of mammals.
hope it helps
#otaku
HAHA
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Answers & Comments
Answer:
Monotremes are mammals that lay eggs. The only monotremes that are alive
today are the spiny anteater, or echidna, and the platypus. They live in Australia,
Tasmania, and New Guinea. These mammals are really different from other
mammals. Their body temperature is lower than most warm-blooded animals, a
feature that has more in common with reptiles. Their name comes from the fact
that they have only one body opening for both wastes and eggs to pass through.
Echidnas have sharp spines scattered throughout their hair. They look like a spiky
ball. The female anteater lays usually one leathery-shelled egg directly into the
pouch on her belly. The egg hatches after only ten or eleven days. The newborn
baby is tiny, about the size of a dime. After the baby hatches, it stays in the pouch
for several weeks and continues to develop. Babies are fed by their mother's milk
that seeps out of pores on her skin. When the babies are six to eight weeks old,
they grow spines that begin to irritate the mother anteater. She then scratches the
baby out of her pouch.
The platypus has webbed feet and a bill. Its body is torpedo-shaped and is
covered with soft fur. Platypuses live in the water. They make mazes of tunnels in
muddy banks along lakes, small streams, or rivers. The female lays her eggs in an
underground nest. After they hatch, the tiny babies drink milk from their mother's
body. They feed by lapping up the milk that oozes onto the fur of their mother's
belly. The platypus' duck-like bill is not like a bird's beak. A bird's beak opens to
reveal its mouth. The platypus' bill is a sensory organ with its mouth on the
underside. The platypus is also one of the few mammals that is venomous. The
male platypus has a spur on its hind foot that delivers a poison that is very painful
to humans. It can kill some small animals.
Marsupial mammals give birth to babies that are not completely developed.
The babies are very tiny. The babies then crawl up the fur on the mother's belly
into a pouch on the outside of the mother's abdomen. The babies drink milk from
the mother and continue to develop inside the pouch. Koalas, kangaroos, wallabies,
and opossums are some of the better-known marsupials. Today marsupials are
found mostly in Australia, New Guinea, and South America. The only marsupial in
North America is the opossum. Opossums may give birth to as many as twenty-one
babies at one time. However, the mother only has thirteen nipples in her pouch.
The first thirteen babies to climb into her pouch and attach to her nipples are the
only ones that survive.
A placental mammal develops inside its mother's body until its body systems
can function on their own. The name of this group comes from the placenta, an
organ in pregnant female mammals that passes materials between the mother and
the developing baby. Food and oxygen, carried by blood, pass from the mother to
the baby through the placenta. Wastes pass from the baby to the mother, where
they are eliminated by her body. Most mammals, including humans, are placental
mammals.
Explanation:
for short:
Monotremes Marsupial and placental mammal are the three types of mammals.
hope it helps
#otaku
HAHA