During a La Niña event, less rain than normal falls in the American West and Southwest. What type of conditions were in effect in the fall of 2007 when California suffered severe wildfires?
1.La Niña
2.Neutral
3.El Niño
1
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Which of the following would be used by a chemoorganotroph for energy?
A) C2H3O2- B) H2 C) CO2 D) H+
When gated sodium and potassium channels open during an action potential, what direction do the ions flow?
a. They both flow from interstitial fluid into the cytoplasm. b. They both flow from the cytoplasm to the interstitial fluid. c. Sodium flows from the cytoplasm to the interstitial fluid and potassium flows the opposite direction. d. Sodium flows from the interstitial fluid to the cytoplasm and potassium flows the opposite direction. e. Potassium flows from the interstitial fluid to the cytoplasm and sodium flows the opposite direction.
Answer the following statements true (T) or false (F)
1. Sexual selection is a type of natural selection resulting from variation in the ability to find mates. 2. Today, 40% of hospital Staphylococcus infections are resistant to all antibiotics except one. 3. Evolution does answer the question as to how life originally began. 4. Artificial selection is responsible for many breeds of dogs and cats. 5. Darwin believed that because of "differential reproductive success" a population would change over time
Why are scientists debating if viruses are living organisms?
a. They infect other pathogens. b. They are so small. c. They are metabolically inert. d. They don't always have DNA. e. They live inside a host.