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...energy, it can seriously increase the likelihood of something bigger coming along and eating you (seriously, check out leopard-slug reproduction). There’s no reason why an animal should seek sex unless they enjoy it. It is often proposed that an inherent “drive to reproduce” explains nonhuman sexual activity, but that is not an alternative here: if animals possess...

...energy factories called mitochondria, in addition to the cell's DNA - packaged into twenty three chromosomes. At the tip of the sperm's head is a package that contains enzymes that break down protective layers on the egg's surface. Not all human sperm cells look the same. Some have two heads or no heads, some have huge heads, some have small tails or no tails, others may...

...energy for life. However, we cannot digest all of the food we eat and what remains undigested, ends up in the sewage system. About 10 billion litres of sewage are produced every day in England and Wales and this has to be treated to remove harmful substances and pathogenic microbes before the waste can be safely released into the environment. The main component of sewage...