What the proxy records make abundantly clear is that there have been significant natural changes in the climate over timescales longer than a few thousand years.
Information on temperature, rainfall, and other aspects of the climate that can be inferred from the systematic changes in properties is usually referred to as proxy data.
Reconstructing the climate changes of the past is extremely difficult, because systematic weather observations began only a few centuries ago, in Europe and North America.
They reasoned that while some evolutionary changes involve the loss of genes and are therefore irreversible, others may be the result of genes being switched off.
Study the changes of hemostatic molecular markers inacute monoblastic leukemia for elucidate the mechanism of hemorrhage and its clinical significance.