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In the Extract below, what is the noun form of effective and another adjectival form for nutritional as they are used in this text? Margaret P Rayman, in a 2000 Lancet medical journal article, titled “The importance of selenium for human health”, explains that selenium is an effective immune booster. As a broad-spectrum, anti-viral nutritional supplement it works to both help prevent and treat viral infections. Selenium helps against most viruses that cause disease in humans. … Just as selenium helps against HIV, hepatitis B and C, influenza, rhinovirus (common cold), Coxsackie, Ebola, Marburg and Hanta, it should also help against Covid-19. (Taken from an information leaflet provided by Selenium Education and Research Centre, Johannesburg, South Africa, May 2020.)

Which word-class is the word trajectories?

Tunicates, or sea squirts, belong to which subphylum of chordates?

Insects belong to which subphylum of Arthropoda?

The presence of a backbone or vertebral column is a characteristic of which chordate subphylum?

Which of these is a marine class of annelids known for their many setae?

Arthropods exhibit which type of symmetry?

What type of symmetry do annelids exhibit?

Annelids typically have a well-developed digestive system with:

Leeches are a class within the annelid phylum. What is a notable characteristic of some leeches?