Which half-reaction correctly represents reduction?
1. ag→ag⁺+e⁻
2.f₂→ 2f⁻ + 2e⁻
3.au³⁺3e⁻→ au
4.fe²⁺+e⁻→ fe³⁺

Each autumn the forest floor is covered by leaves that have fallen from trees which type of organisms is most effective in decomposing the leaf tissue allowing the nutrients and minerals to be recycled in the environment?

Some studies have found that what percentage of students have cheated in some form? a. 10% b. 25% c. 45% d. 75%

Environmental science jobs are expected to grow by how much between now and 2016? a) 5% b) 15% c) 25% d) 100%