One of the few features that are uncontroversial is the body size: The fossils measure usually 1-5 cm in length.
Finely tuned and exquisitely engineered, this system gave our ancestors enough oxygen not only to stay alive but to thrive in the face of grave challenges.
No one knows how apoptosis came to be, although there are theories. Even the simplest of animals are programmed for it.
A little-known fact about intelligent design is that the majority of it scientists already perform their work alongside colleagues with differing views.
How is water the “universal solvent”? What is viscosity? How does water keep temperatures stable?