Scientists predict that sponges—among the most basic animals—arose a few hundred million years before the occurrence of the oldest confirmed fossil specimens, which date to about 500 million years ago ...
What do animals need to survive? Discover the basic things all animals need to survive. What do humans need to be healthy? Learn what humans need to be healthy and how to stay healthy.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback