#Question id: 11713
#Unit 9. Diversity of Life Forms
Theoretically, which two of the following present the richest potential sources of silica?
1. marine sediments consisting of foram tests
2. marine sediments consisting of diatom cases (valves)
3. marine sediments consisting of radiolarian shells
4. marine sediments consisting of dinoflagellate plates
#Question id: 11759
#Unit 9. Diversity of Life Forms
Thread-like pseudopods that can perform phagocytosis are generally characteristic of which group?
#Question id: 11760
#Unit 9. Diversity of Life Forms
Which of the following produce the dense glassy ooze found in certain areas of the deep-ocean floor?
#Question id: 11761
#Unit 9. Diversity of Life Forms
A snail-like, coiled, porous test (shell) of calcium carbonate is characteristic of which group?
#Question id: 11762
#Unit 9. Diversity of Life Forms
Typically as cells grow, their increase in volume outpaces their increase in surface area, and continued survival requires undergoing asexual reproduction to reestablish a healthy surface area to volume ratio. Thus, which of these is least likely to contribute to the ability of a single-celled foraminiferan to grow to a diameter of several centimeters?
#Question id: 11763
#Unit 9. Diversity of Life Forms
What makes certain red algae appear red?