Bob is 50 years old. if he is typical for his age, what is one of his major health concerns at this stage of life?

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?

Describe five factors that influence the value of fuel

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