True or false questions about producers and consumers?

True or false:

1. Diatoms are estimated to produce most of the Earth’s atmospheric oxygen.
2. Like land plants, algae have vascular systems for circulating internal fluids and nutrients.
3. Primary food consumers eat mostly plants.
4. Sponges and barnacles are two good examples of filter feeders.
5. Sea slugs, snails, and limpets are all examples of ogranisms in the ocean known as grazers.
6. Whales are the largest fish in the ocean.
7. Plankton is made up of a mixture of hundreds of different kinds of microscopic animals and plants.
8. Coral are actually made up of small hollow gut animals (Cnidarians) which secrete calcium carbonate to build a community of homes in which to live.
9. Scavengers feed mostly on dead animals and plants.
10. The sun is the ultimate source of most of the biological energy on our planet.