Which of the following are sources of CO2 and CH4 (methane)? Decomposition by bacteria in swampy environments
Burning of fuels
Normal respiration/breathing of organisms
All of these are sources of CO2 and Methane

What was piaget's explanation as to why preschool-age children in the preoperational stage make errors on tasks requiring conservation? a) preschool children's tendency toward centration prevents them from focusing on other relevant features of a situation b) preschool children have not yet developed numerical understanding; therefore, different amounts are meaningless c) preschool children's neural-visual network is not fully matured d) preschool children have not lived long enough and accrued enough experience to know the difference between quantities