1. How did the blue-gren algae (cyanobacteria) cause the fist mass extinction?

2. Describe how the structure of erythrocytes is advantageous for their function as oxygen transporters

3. Describe the anatomical features of cardiac cells that allow for coordinated contractions.

4. Define and explain the significance of vascular anastomoses in arteries and veins

5. Where are Kupffer cells found?

6. Describe the process of double-fertilization in an angiosperm, andexplain the significance of this process in plant evolution.