It is commonly assumed that because males produce many, tiny sperm, they are cheap to produce. Recent work, however, suggests that sperm production is not cost-free. If sperm are costly to produce, ...
Female cockroach droppings contained about 2,900 endotoxin units per milligram – more than twice the amount found in male droppings (1,400 EU/mg). On average, each female released around 5,000 ...
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