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| Read each sentence and identify the word/phrase that you believe correctly completes the statement. Then, click on the arrow to see if your answer is correct. 1. Seaweeds can be distinguished from plants because they lack three types of specialized tissues: , and . 2. The two most important planktonic, unicellular algae are the diatoms and the . Diatoms are especially important in , whereas the second group is more important in tropical waters. 3. Seaweeds are algae, but in contrast to the unicellular algae they are . 4. Three groups of seaweeds are recognized. In the green algae, is not masked by any other pigments, so the thallus is bright green. The algae include the largest and structurally most complex seaweeds, whereas the third group, the algae, includes the largest number of species. 5. Almost all flowering plants live on land except three major groups. The are truly marine because they are rarely exposed to air. Two other groups, the salt-marsh plants and , are essentially land plants that are salt-tolerant. |