Scientists believe that over 99% of species that once existed on Earth are now extinct.
D. over 99 percent
Answer:
(a) Muscle B contracts and muscle A relaxes
(b) The Heart
Help ease people through the withdrawal process.
Answer:
A bat using echolocation.
A whale using sonar waves.
A gazelle listening to the footsteps of a cheetah and running away.
Explanation:
My extensive knowledge of the show Wild Kratts.