THE life-cycle of the mammalian red corpuscles is not known with certainty. Values varying between 30 and 200 days are recorded. One would expect the problem to be easily solved by making use of an ...

Students explore and compare chicken and butterfly life cycles. In this lesson, students explore and compare chicken and butterfly life cycles through the development of scientific drawings or models.

IN a former communication 1, a method of determining the life-cycle of nucleated erythrocytes was described. The method is based on the fact that radiophosphorus incorporated into desoxyribose-nucleic ...