This is a small ppt on the evolution of frogs.

1. Evolution Of A FROG
Click on the MUSCULAR FROG to know about its
GREAT-GREAT-GREAT-GREAT GRANDFATHERS

2. Approximately 360 million years ago,
amphibians left the sea and were successful
on the land because of the lack of other
vertebrates to hunt them.

3. While frogs did make many of these adaptations, they
Were not entirely successful.

4. The oldest fossil "proto-frog" appeared in the early Triassic of
Madagascar, but molecular clock dating suggests their origins may
extend further back to the Permian, 265 million years ago.
Frogs are widely distributed, ranging from
the tropics to subarctic regions, but the greatest concentration of
species diversity is found in tropical rainforests. There are
approximately 4,800 recorded species

5. Triadobatrachus is an extinct genus of frog-like amphibian.
It is the oldest frog known to science. Triadobatrachus was
10 centimeters (3.9 in) long, and still retained many
primitive characteristics, such as possessing
fourteen vertebrae, where modern frogs have only four to
nine. Six of these vertebrae formed a short tail, which the
animal retained as an adult.
It probably swam by kicking its hind legs, although it
could not jump, as most modern frogs can. Its
skull resembled that of modern frogs, It
lived during the Early Triassic about 250 million years
ago, in what is now Madagascar.

7. BEWARE!!! BEWARE!!!
BEWARE!!!
Ironically--considering that they evolved over 300 million years ago and
have survived, with various waxings and wanings, into modern times--
amphibians are among the most threatened creatures on the earth today.
Over the last few decades, a startling number of frog, toad and
salamander species spiraled toward extinction, though no one knows
exactly why: the culprits may include pollution, global warming,
deforestation, disease, or a combination of these and other factors. If
current trends persist, amphibians may be the first major classification of
vertebrates to disappear off the face of the earth!