The time interval used to measure the absolute age of rocks by radiometric dating is called the ____
a. radioisotope unit
b. radiometric unit
c. radiometric life
d. radioisotope life
e. half-life
ANSWER: e
You might also like to view...
Over generations in a population, traits seen in individuals with higher fitness values will
A. become less prevalent in the population. B. become more prevalent in the population. C. stay at the same frequency in the population. D. decrease the population's mean fitness.
Each of the following is true regarding cancer cell metastasis to secondary sites except
A) cancer cells may multiply in regional lymph nodes if they enter via lymphatics. B) many cells from the primary mass may enter circulation. C) all cancer cells circulating in the bloodstream are identical. D) few cancer cells survive in the bloodstream. E) the population of cancer cells is heterogeneous.
Nicotine synthesis is a(n) adaptation of plant chemical defense against insects. Indicate whether the statement is true or false
You are reading the journal of an amateur naturalist who visited the Sonoran Desert in the last century. Which of his descriptions of desert plants would you question?
A) a plant whose seeds will not germinate unless soaked B) a perennial that flowers only after years of vegetative growth and produces a large number of seeds C) a late winter hillside covered with wildflowers D) a common annual that produces one large seed per plant