Polar bears are members of which of the following orders?
A) Carnivora
B) Cetacea
C) Chiroptera
D) Rhenanida
E) Sirenia
A
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Almost all species of bony fish today are ray-finned fish
a. True b. False
An example of a density-independent factor would be ________
A) a plant parasite, such as mistletoe B) blight (a mold disease) in a wheat field C) cold weather causing a lake to freeze D) suitable nest sites for a flock of warblers E) a specialist searching for the one species of plant that is its food
Irrigation can result in the salinization of soils because ________
A) irrigation is typically used in areas where windblown salts from sea spray can accumulate when the protective vegetation is removed B) many of the plants grown in these regions excrete salts into the soil C) the irrigation water washes away soil leaving behind concentrated salts D) salts in the water are deposited on the soil surface as water evaporates E) shortages of fresh water require the use of saltwater for irrigation
Why are metamorphic rocks difficult to date accurately? What will be an ideal response?