1. Five people have been killed and one Mexican marine wounded in the clash.

2. One pilot and a Russian marine of the rescue party were killed in the incident.

3. The discovery could also change how we view ancient marine dwellers.

4. At the same time, these actions destroy the habitat of many marine species.

5. There are two primary sources of marine pollution.

6. One is to create marine protected areas.

7. The proposed marine reserves are the latest example.

8. The algae are harmful to marine life and to humans.

9. Kids direct their learning as they interact with more than 30 species of marine animals and fish.

10. In 2011, a marine opened fire on his colleagues and tried to blow himself up with a grenade.

11. Without oxygen dissolved in the water, marine life suffocates.

12. He called the crash a shocking, horrific marine tragedy.