In a sealed tank is a large sprig of elodea and a snail. the tank is kept for several weeks on a sunny window sill. both the plant and snail live and appear to be healthy. why does this happen? a. the snail produces oxygen, and the plant produces carbon dioxide. b. both the snail and the plant produce oxygen. c. the snail produces carbon dioxide, while the plant produces oxygen. d. both the snail and plant produce carbon dioxide.

Which excerpt from the land, part 4 best supports the claim that paul is a talented horseback rider? a/“figure that says more than anything else! now, i want to ride that stallion! " b/my daddy shook his head. "paul only rides horses he knows. ” c/? i glanced over at the other rider. the fellow was older than i, and had the weight of a man on him. d/a man out of alabama, man name of ray sutcliffe, told my daddy i was such a good rider, he wanted me to ride some races for him.

What is the 77 element on the periodtic table

What are some possible short and long term medical concerns for crew members on longer space exploration trips