What is considered the most structurally complex animal phylum?
a. Chordata
b. Echinodermata
c. Mollusca
d. Arthropoda
e. Annelida
a
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What is the main obstacle to extracting rare-earth metals from a deposit?
A. They are typically found at low concentrations in the host rock. B. They are equally distributed around the world. C. There is a lack of technological understanding about how to extract them. D. There is no demand for them on the world market.
Russian population is densest to the ________ of the Ural Mountains
A) north B) east C) west D) south
What is NOT a characteristic of serfs in Europe?
A) low standard of living B) low life expectancies C) monotonous lives D) ownership by a master E) they made up most of the rural population
Which of the following is considered point source pollution?
A) Fertilizers from lawns B) Municipal sewage sludge C) Pesticides from agriculture D) Road oil from automobiles E) Trash washed down storm drains