The first species to live on new land, such as that formed from volcanic lava, are called
A: clomax community.
B: keystone species.
C: foundation species.
D: pioneer species.
E: parasite.
A: clomax community.
B: keystone species.
C: foundation species.
D: pioneer species.
E: parasite.
举一反三
- Effects of long term use of pesticides include ( ) A: imbalances in ecosystems B: develop new dominant pest species C: lose keystone species. D: Beneficial organisms and even natural enemies of the pests may be among the species eliminated by pesticides
- 18 未知类型：{'options': ["It's the cradle of civilization.", 'There are many kinds of birds.', 'There is plenty of species.', 'There are various species of fish.'], 'type': 102}
- The representative strain that can represent the typical characteristics of a strain is called ( ). A: Model species B: Typical species C: Representative species D: Reference species
- Over the last century, paleontologists have used small differences between fossil specimens to classify Triceratops into sixteen species. This classification is unjustified, however, since the specimens used to distinguish eleven of the species come from animals that lived in the same area at the same time. Which of the following, if true, would enable the conclusion of the argument to be properly drawn A: Not every species that lived in a given area is preserved as a fossil. B: At least one individual of every true species of Triceratops has been discovered as a fossil specimen. C: No geographical area ever supports more than three similar species at the same time. D: In many species, individuals display quite marked variation. E: (E) Differences between fossil specimens of Triceratops that came from the same area are no less distinctive than differences between specimens that came from different areas.
- How many_______known altogether A: species of fishes are B: species of fish is C: specieses of fish are D: species of fish are