How old the second row values in the panic room and most likely compared to the second row values in the original experiment a. oxygen levels will be higher, but carbon dioxide levels would be lower b. carbon dioxide levels would be higher, but oxygen levels would be lower. c. oxygen levels would be higher, but carbon dioxide level to be the same. d. carbon dioxide levels would be higher, but oxygen levels would be the same.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

what is shown in the image?

eukaryote

chloroplast

mitochondrion

submitted

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.