n. a rapid increase in growth which occurs during adolescence (*) oxygen (*) blockage (*) growth spurt (*) surfactant

n. positively charged ions (*) acylation (*) group (*) cation (*) binary fission

n. either one of a pair of chemical components whose molecular structures have a mirror-image relationship to each other (*) transition state (*) pyrimidine (*) seminiferous tubules (*) enantiomer

n. subatomic particle with one positive charge (*) puberty (*) proton (*) oviduct (*) vein

n. gases such as carbon dioxide and methane that absorb infrared radiation which warms the atmosphere (*) greenhouse gases (*) ophthalmoscope (*) motor neuron (*) embryology

n. the splitting of the whole into parts (*) polysaccharide (*) division (*) spermatogenesis (*) micturition

n. master endocrine gland which is attached to the hypothalamus at the base of the brain (*) pituitary gland (*) calcium (*) nodes of Ranvier (*) autotroph

n. substance secreted in the outer ear canal by special glands (*) myopic (*) hibernation (*) cerumen (*) ear wax

n. male sex organ found in the scrotum (*) condensation (*) testicle (*) chromatin (*) heartburn

n. hard protein found in skin; hair or nails (*) neurilemma (*) keratin (*) thymine (*) polyunsaturated fatty acid