621Seed plants are broadly divided into monocots and dicots mainly based on the number of what structure in the seed?
622Which of the following is a classic example of a monocot plant, having only one seed leaf?
623Which of the following is a classic example of a dicot plant, having two seed leaves?
624The entire animal kingdom is scientifically classified under which formal taxonomic name?
625Animals that possess a backbone, or spinal column, are collectively classified as what?
626Animals that lack a backbone are collectively classified as what?
627The vast majority of known animal species on Earth actually belong to which broad category?
628Which animal phylum, which includes insects, spiders, and crustaceans, contains the largest number of known species?
629Cold-blooded animals that typically lay eggs and have dry, scaly skin are generally classified as what?
630Warm-blooded animals covered in feathers that generally lay eggs are classified as what?
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