If pills are taken every day at the same time, and each pack is started on time, oral contraceptives are 99% effective in preventing pregnancy. On average, oral contraceptives are 93-97% effective because women often miss pills or do not start a new pack on time.
Kangaroos are large marsupials that are found only in Australia. They are identified by their muscular tails, strong back legs, large feet, short fur and long, pointed ears.angaroos are the only large animals that hop as a primary means of locomotion. Their springy hind legs and feet are much stronger and larger than their arms (or forelimbs). According to the San Diego Zoo, kangaroos can cover 15 feet (7 m) in a single hop and can hop as fast as 30 mph (48 kph).
All of the members of the Macropodidae family of marsupials (which is everything that is vaguely kangaroo shaped) are only found in Australia and New Guinea. Kangaroos first evolved sometime between 30 to 12 million years ago. This is after Australia was last connected to Antarctica, so Kangaroos (and most modern marsupials) have been isolated from the rest of the world since then.