Match the disadvantages to the correct conservation methods. building national parks
recycling resources
using wind energy
threat to birds
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lack of protection against external threats
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fewer collection centers
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What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures

Archaebacteria use for movement. celia flagella pili cell walls

Which statement describes compounds a. compounds are made of one type of atom. b. compounds cannot be represented by models. c. compounds are represented by chemical formulas. d. compounds cannot be broken down into simpler forms.