A paraphyletic group contains
A. a common ancestor and all of its descendants.
B. groups of species with different common ancestors.
C. every species ever derived from a common ancestor.
D. a common ancestor but not all of its descendants.
E. a common ancestor and all of its descendants but not the most recent common ancestor.
Answer: D
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Which of the following statements is true about photosynthesis and chemical weathering? Select all that apply
A. Both processes release CO2 as a product (i.e., increase atmospheric CO2 levels). B. Both processes use CO2 as a reactant (i.e., decrease atmospheric CO2 levels). C. Both processes are typically associated with the long-term carbon cycle. D. Both processes are typically associated with the short-term carbon cycle.
Do all of the nucleotides contain a different nitrogenous base?
a. yes b. no
It is beneficial for children in underdeveloped countries to eat genetically modified "golden rice," rather than regular rice, because golden rice:
A) tastes better. B) prevents diarrhea in children. C) does not cost as much as regular rice. D) produces a vitamin A precursor, which helps prevent blindness in children.
The pharynx contains the tonsils, which protect against invasion of inhaled foreign particles.
Answer the following statement true (T) or false (F)