Fish Heart News Today

The heart is S-shaped and has two chambers, which led researchers to draw similarities between the fish and modern sharks.

When Charles Darwin published On the Origin of Species in 1859, it outlined a new scientific theory. Darwin reasoned that populations of organisms evolve over generations through a process that he termed “natural selection.” His work offered evidence that the diversity of life on Earth arose by common descent through a brachiating pattern of evolution. Origin explained the diversity and existence of new plant and animal species, but Darwin tiptoed around the question of what exactly this ...