It is during the ____ period of prenatal development that nearly all the major organs are formed

21. In positron emission tomography, when positrons come into contact with a free electron, they are annihilated. This annihilation produces two byproducts

a) 2 photons b) 2 protons c) 2 electrons d) 2 positrons

Grief is to mourning as

a. feelings are to action. b. action is to feelings c. public; private. d. private; public.