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In piecing together our ancestors' habits, corroborating lines of evidence are vital if we are to be confident that the emerging jigsaw reveals the true picture.
The similarity of hydrophobic hormones in plants and animals suggests that once you make a good key, with occasional filing it can be used in many different developmental locks.
Calculating the area of productive ecosystem required to support a population is a useful way to open people's eyes to the fact that we're stamping out the world's resources.
Clinical oncologists and tumour biologists possess virtually no comprehensive model to serve as a framework for understanding, organizing and applying their data.
Efficient cloning will require the ability to reset the gene-expression programmes of specialized cells, in the same way that sperm and eggs form undifferentiated embryonic cells.
A primary function of mitochondria may have been to compartmentalize respiration, thus protecting cells from the damaging side-effects of oxygen metabolism.
A cut into the soul as a result of a horrifying experience can persist as a crippling disease with its core conceptualized as post-traumatic stress disorder.