1) muscles are organs composed mainly of muscle fibers.
true
false
2) muscles appear striated, or striped, because their cells are arranged in sheets.
true
false
3) involuntary contractions mean they are not under conscious control.
true
false
4) contractions of skeletal muscle are involuntary.
true
false

Text version using the diagram above, match the description to the corresponding location in the carbon cycle model. provide the letter only. carbon dioxide is converted to sugar used for food. carbon trapped in fossil fuels is converted to carbon dioxide. organic carbon is converted to fossil fuels. carbon dioxide is converted to carbonates. sugar is broken down and converted to carbon dioxide. location location location location location