Problem: OPTIONS:
- liquid black
- dioxide black
- dark black
- carbon black
Q: Q: What is the amorphous form of carbon prepared by the incomplete combustion of natural gas? A:
Answer: carbon black

Problem:OPTIONS:
- remains stable
- folds
- sinks then rises
- rises then sinks

Q: How does deeper material cause convection in the mantle? A:
****
A: rises then sinks

Q: Where is chlorine gas produced? A:
OPTIONS:
- in the nucleus
- carbon cycle
- epidermis
- at the anode
at the anode

Q: Coral reefs and tropical rainforests are ecosystems known for what, contributing greatly to the species in existence on earth? A:
OPTIONS:
- commensalism
- mass migrations
- spontaneous mutation
- biodiversity

Answer: biodiversity

Question: Q: What is the study of the vital statistics of populations and how they change over time? A:
OPTIONS:
- sociology
- ethnography
- anthropology
- demography
Answer: demography

input: OPTIONS:
- pyramid
- coil-shaped
- tubular
- hollow ball shaped Now, answer this question: Q: What shape is the colony of a volvox cell? A:
A:
output:
hollow ball shaped