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In most ecosystems, sunlight provides the ultimate source of energy to power all biological activity
The trilobite body is divided into three major sections
The major skeletal muscles—anterior superficial view.
Structures of the major prostaglandins and thromboxane A2
The major events in meiosis in an animal cell with metaphase
Maternal age is the major risk factor for autosomal trisomies of all types. By age 42, about one in