The source of energy for nearly all ecosystems is 

A. the sun.
B. food.
C. oxygen.
D. water.


A. the sun.

Biology & Microbiology

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The ____ layer of the mammalian gut performs peristalsis

a. mucosa b. muscularis c. serosa d. submucosa e. submucosa and muscularis

Biology & Microbiology

A bacterial loop entails a portion of the food web in which bacteria convert dissolved organic matter into consumable bacterial biomass

Indicate whether the statement is true or false

Biology & Microbiology

Biodiversity refers to _____

a. genetic diversity b. species diversity c. ecosystem diversity d. all of these

Biology & Microbiology

Plants adapted to low-nutrient environments are characterized by

A) a high growth rate. B) decreased root production. C) increased leaf longevity. D) faster growth when more nitrogen is available.

Biology & Microbiology