Which of the following modes of transportation are most often used for short-distance delivery because they can be loaded and unloaded quickly and cheaply?
A) airplanes
B) cargo ships
C) freight trains
D) trucks
E) speedboats
Answer: D
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Coarse grained igneous textures indicate that:
a) there was a lot of gas in the magma b) the rock cooled quickly c) the rock broke apart as it flowed d) the rock cooled slowly e) the ash and pumice were hot and became compacted
Darwin and Wallace discovered natural selection without knowledge of an important field of biology that is very much a part of biological evolution
What essential part of biological evolution was poorly understood when they first presented natural selection to the world? A) Geology B) Genetics and DNA C) Anatomy D) Physiology and embryology
The stratospheric ozone layer is important to ecosystems because it ________
A) absorbs and scatters UV light B) keeps atmospheric gases balanced C) keeps the temperature of Earth stable D) provides the air we breathe E) ensures lakes and oceans do not lose water
Most Atlantic tropical cyclones have their origin in
A. the Caribbean. B. the Gulf of Mexico. C. the middle of the Atlantic Ocean. D. northwest Africa.