In the atmosphere can earth's surface by blocking sunlight.
a. dust or ash; cool
b. dust or ash; warm
c. carbon dioxide; cool
d. carbon dioxide; warm

there is not 1 highest source of protein, but there are many; meats, fish, poultry, seafood, cheese, eggs, yogurt and milk. the only non complete animal food that is beneficial is gelatin.

sorry if this did not , have a great day!

carbon traps heat so more of it makes it hotter causing global warming. during the ice age carbon levels in the atmosphere were low so it got very cold. so the common things between them is carbon levels in the atmosphere.