It's easier to devein shrimp before they are cooked. 1  Use a sharp paring knife to cut a slit along the outer curve of the shrimp's body. 2  The cut will reveal a dark brown or black vein, the shrimp's digestive tract. 3  Use your fingers, a fork or the paring knife to lift it out of the shrimp and discard it.
Last year marked the bicentenary of the birth of Charles Darwin. But this essay is not about Charles Darwin. It is about a contemporary of his, Herbert Spencer, who was developing a theory of evolution before Darwin and is credited with coining the phrase the survival of the fittest.. His books sold in huge numbers during his lifetime and he was almost certainly the most famous philosopher of the Victorian age.
D. Overproduction of offspring. Darwin's theory of natural selection states that species tend to overproduce due to limiting resources. This sets up competition or a struggle for existence. Those most fit in that environment are likely to survive, passing those favorable genes on to their offspring. In time, a new species evolves from the accumulation of favorable genes. Punctuated equilibrium is a theory that was formulated after Darwin's theory and it states that species remain relatively stable for long periods of time and then, due to some natural catastrophe, change rapidly in a short period of time.