The combustion of fossil fuels is altering the balance between photosynthesis and ________.
A. sunlight
B. respiration
C. growth
D. decomposition
Answer: B
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Pioneer plant species are usually characterized by
a. small size. b. high dispersal rates c. slow maturation. d. high dispersal rates and high numbers of offspring e. small size, efficient dispersal mechanisms, and slow maturation.
People with cystic fibrosis have difficulty digesting food properly. Indicate whether the statement is true or false
An atom of nitrogen attracts electrons more strongly than an atom of hydrogen. In an ammonia molecule (NH3), which of the following best describes the electrical charge of the individual atoms?
A) The nitrogen is slightly more negative. B) The nitrogen is slightly positive. C) The hydrogens are strongly negative. D) The nitrogen becomes neutral. E) Charges balance out and none of the atoms has any charge.
HIV/AIDS is one of the ten top causes of death in the United States.
a. true b. false