Why does the microbiota of the reproductive tract change as the female ages from childhood to adulthood to old age?
A. The microbes in the vagina change the environment, which affects the populations of microbes living there.
B. The pH of the vagina changes over time.
C. Post-menopausal women have a stable microbiota.
D. Her estrogen and progesterone levels change over time.
E. All of these statements are true.
Answer: E
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In both progeria and Werner syndrome, cells are switched from a growth to a maintenance mode, halting ____________________
Fill in the blank(s) with correct word
Most carbohydrates, lipids, and proteins are digested, and most nutrients and water are absorbed in the ________
a. small intestine b. stomach c. large intestine d. esophagus
Of the following, which are believed to be the two main reasons for mass extinctions in Earth's history?
A. human actions and the shift of Earth's continents B. global warming and the shift of Earth's continents C. impact of Earth with a large, celestial body and the shift of Earth's continents D. impact of Earth with a large, celestial body and human actions E. global warming and human actions
The evolution of __________ was crucial in the
evolution of plants from aquatic to terrestrial environments. a. roots b. leaves c. stems d. stomata e. all of these