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Questions in biology

[Free] An ecologist counts weeds to monitor their populations. Which of the following best describes the ecologist's methods?

[Free] Compare the adult frog to the tadpole.

[Free] During the time when humans moved from Africa throughout the world, choose the correct statement: A. Birth and death rates were both fairly low. B. Population growth was rapid. C. Population growth was slow. D. There was no population growth.

[Free] Which of the following is NOT considered a potential cause of extinction? (A) Introduction of a new predator (B) Introduction of a new parasite (C) Introduction of a new mutation (D) Interspecific competition for limited resources (E) Habitat destruction Please explain the reasoning behind your choice.

[Free] Two identical daughter cells result from mitosis and cytokinesis. In what ways are they "identical"?

[Free] Name and describe an example of a parasitic relationship involving a fungus.

[Free] Which of the following best explains the origin of the predation ability of Venus flytraps? A. Only those plants with the ability to supplement the poor nutrient content of their soils could survive. B. Predation allowed the Venus flytrap to outcompete other species because of its ability to move rapidly. C. As consumers instead of producers, Venus flytraps have greater access to better nutrients. D. Predation allowed the Venus flytrap to collect a wider variation of preformed organic materials. E. Better nutrients allowed the Venus flytrap to grow faster than other plants.

[Free] In conditions of stress or fear, the human adrenal gland may produce adrenaline. Which of the following is an effect adrenaline can have on the body?

[Free] Which of the following is LEAST likely to result in speciation? A. Random mating among members of a large population of a species B. Occurrence of hybridization between individuals from two different species C. Development of different mating behavior by some members of a species D. Emigration to a specialized microenvironment by some members of a species E. Formation of a physical barrier that blocks gene flow between members of a species

[Free] Where sugar concentration is high, what is the source of water taken in by the phloem?