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Which of the following is a characteristic that originated independently in birds and mammals, representing homoplasy (not homology)?

Which of the following protists are the most important photosynthetic primary producers in the ocean, creating over 45% of the sugars used by all oceanic animals either directly or indirectly?

Which vascular cells conduct water most efficiently, and are found in Angiosperms (flowering plants) and members of the Gnetophyta?

 Ecdysozoa is a subgroup of protostomes that ____.

Lichen are Ascomycota fungi, that have a mutualistic relationship with algae. Which of the following structures houses their spores?

Which type of flowering plant is this?

Which of the following classes is comprised of carnivorous predators that are able to extend their stomachs through their mouths to feed?

All vertebrates are chordates. 

Which of the following statements best describes the term synapomorphy?

Which of the following is true of all protists?