Cohort studies start out by measuring exposure and watching for the development of disease.
a. true
b. false
b. false
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Neutron stars are the size of ________
Fill in the blank(s) with correct word
What is oxidation?
A) the loss of electrons B) the reaction with oxygen C) the reduction of oxygen D) the gaining of electrons E) the addition of an electron to the valence shell
On the scale of the cosmic calendar, in which the history of the universe is compressed into 1 year, how long is the average human life span?
A) 0.2 millisecond B) 0.2 second C) 2 seconds D) 2 minutes E) 2 hours
On a planet whose Moon is in the same orbital plane as the planet's orbit around itsstar, how often will solar eclipses occur?
a) Twice every orbit of its moon (twice a month). b) Once every orbit of the planet around its Sun (its year). c) Twice every rotation of the planet (twice a day). d) Once every orbit of its moon (its month). e) Once every rotation of the planet (its day).