A Canadian geologist might have just discovered fossils of sponges that date back 890 million years. This discovery might be 350 million years older than the oldest-found sponge fossils. The fossils were found in rock samples, and it seems that ...
Most of us can recognize an animal by its physical appearance, where it lives and by the sounds it makes. It is enough to hear a dog bark, and we immediately recognize what animal it was. Humans also consider communication ...