What percentage of all living and fossil animals are invertebrates?
A) 10%
B) 50%
C) 70%
D) 90%
D
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Canyons formed due to stream erosion from the uplift of the Appalachian mountains are called __________________
__________________. What will be an ideal response?
Along coastlines, sand dunes will most often begin to form and grow when ________
A) annual plants become established B) diverse grasses and woody shrubs thrive C) perennial grasses become established D) erosion and subsequent deposition bring in the necessary sand E) birds carry tree seeds to the area, which then become established
The most widely spoken Indo-European language is
A) English. B) Hindi. C) Spanish. D) Bengali. E) Indo-European.
Despite their idyllic island appearances, atolls pose many natural hazards to human habitation.What are three factors that make human habitation on atolls difficult?