Soils with a pH greater than 7 are considered to be ________
Fill in the blank(s) with correct word
basic or alkaline
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All mammals except the metatherians are viviparous
Indicate whether the statement is true or false.
The net weight of all of the organisms living in an ecosystem is its
A. productivity. B. biomass. C. vital force. D. photosynthesis minus metabolism. E. combined output of metabolism and photosynthesis.
Over the past 500 million years, there have been ________ mass extinctions, and each time, at least ________ of the species on Earth became extinct
A) two; 25% B) five; 25% C) five; 50% D) twelve; 96%
_____ is the process in which two groups of organisms living in the same habitat diverge into separate species
A. allopatric speciation B. peripatric speciation C. adaptive radiation D. co-speciation E. sympatric speciation