Two types of pine trees share a common habitat in eastern Texas. Although both types of pine trees produce pollen at the same time, the pollen grains from one type of pine tree are not able to pollinate the ovules of the other type of pine trees. Which of the terms describes the relationship between the two types of pine trees? I. prezygotic isolationII. postzygotic isolationIII.habitat isolationIV. sympatric species
A: I only
B: I and IV
C: II only
D: II and III
A: I only
B: I and IV
C: II only
D: II and III
举一反三
- Pine trees are usually believed to _______ cold weather.
- 262.30 % of the young trees, attacked by diseases, ________pine trees. A: is B: are C: was D: has been
- Which of the following paintings was created by Zhao Mengfu? A: Pines Along the Stream B: A Landscape in Four Seasons C: A Level-distant View of Two Pine Trees
- "Four Wonders" of Mount. Huangshan are pine trees, rock formation, sea of clouds, and _________.
- Which of the followings are not belong to traditional Chinese painting? A: peony B: peacocks C: pine trees D: panda