Which of the following is a characteristic of nonvascular plants?
A) Extensive root system
B) Stems and leaves
C) Xylem and phloem
D) Small size
E) All of the above
D
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Which of the following statements about natural selection is true?
a. Natural selection causes variations to arise within a population. b. Natural selection leads to increased likelihood of survival for certain individuals based on variation. The variation must come from outside the population. c. All individuals within a population have an equal likelihood of survival. Survival is based on chance. d. Natural selection results in those individuals within a population who are best-adapted surviving and producing more offspring. e. Natural selection leads to extinction.
Smaller mammals typically have higher ventilation rates than large mammals.
Answer the following statement true (T) or false (F)
Pheromones
a. are social signals. b. are detected by the vomeronasal organ in reptiles and most mammals. c. may serve as sex attractants. d. are not detected or responded to by humans. e. include all EXCEPT “are not detected or responded to by humans.”
Why can flowers be brought "into bloom" out of season by changing the duration of light and darkness?
What will be an ideal response?