Forests can be totally destroyed by ______ fires.
Fill in the blank(s) with the appropriate word(s).
crown
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In an ecosystem with many similar species, we typically find
A) low levels of interspecific competition, mostly for food. B) competitors using different resources to minimize interspecific competition. C) intense interspecific competition mostly for suitable habitats. D) adaptations for battles and intraspecific competition.
What 1969 disaster in Southern California prompted the organization of the first Earth Day in 1970?
A) The 100th death in Los Angeles due to air pollution. B) A trash dump catching fire. C) An off-shore oil spill. D) A massive river fish kill.
To maintain agricultural productivity in deserts, farmers should use ____________________ to both provide water and flush the soil
Fill in the blank(s) with correct word
The vertical distance from the still water level to the crest of a wave is called the ________
A) trough B) amplitude C) oscillation D) swash E) refraction