Hypoxic, or dead zones, in the ocean is caused by?

Explain the Greenhouse Effect – including what causes it and why it is a problem.

Which phylum has the largest number of species?

What happens when the ocean absorbs more carbon dioxide?

How much of the Earth’s surface is covered by the world’s ocean?

Sharks, the vertebrates that have a skeleton made of cartilage, belong to which group?

Identify the phylum that contains jellyfish.

Choose the pair of gases required by nearly all marine organisms to stay alive.

What percentage of all living and fossil animals are invertebrates?

Why is photosynthesis done in the epipelagic zone?