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THE NATURE AND CRITERIA OF SENESCENCE
THE DISTRIBUTION OF SENESCENCE
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activity actuarial adult age processes Amer animals appears bees Biol biological birds breeding captivity causes cell division cellular cent chromosome clones collagen Daphnia death decline decrease differentiation Drosophila effect eggs endocrine escence evidence experimental experiments factors females fish force of mortality forms genetic Gerontol gerontology gland gonadal groups growth hormone growth-rate heterosis homoeostasis human hybrids imago inbred increasing age individuals insects instar invertebrates irradiation Lebistes life-cycle life-span life-table living London Zoo long-lived longevity male mammalian mammals maximum McCay mechanism metabolism metazoan mice micronucleus mitosis molluscs morphogenesis morphogenetic mutation natural normal observed occurs old age organisms ovary Paramecium pelecypods physiological pituitary planarians populations probably produced progeny progeria prolonged radiation rats reached records relation reproductive retarded rotifers senescence senile change sexual somatic species specific age specimens studies suggested survival curve teleosts theories tion tissue vertebrates Verzar vigour wild young Zool