Impact of hydrogen on fossil fuel production

Which would best keep the oxygen cycle stable? a. cutting down jungles to create farmland b. eliminating parks in large cities c. dumping toxic chemicals into the ocean d. reducing the amount of deforestation d. reducing the amount of deforestation

Aperson with age is more likely to catch diseases that healthy people usually don’t catch. what are these infections called?

Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above