Oil and Plants
The two main sources in water vapor are farming and manufacturing
The two main sources of air pollution are the toxins released from factories and automobiles.
No, the main sources of the Nile are the White Nile and he Blue Nile
The Blue Nile and the White Nile are the two main sources of the Nile River.
Carbohydrate,fat
The Romans obtained their food by either growing it or by importing it. Egypt and Sicily were two of the main sources for Roman food.The Romans obtained their food by either growing it or by importing it. Egypt and Sicily were two of the main sources for Roman food.The Romans obtained their food by either growing it or by importing it. Egypt and Sicily were two of the main sources for Roman food.The Romans obtained their food by either growing it or by importing it. Egypt and Sicily were two of the main sources for Roman food.The Romans obtained their food by either growing it or by importing it. Egypt and Sicily were two of the main sources for Roman food.The Romans obtained their food by either growing it or by importing it. Egypt and Sicily were two of the main sources for Roman food.The Romans obtained their food by either growing it or by importing it. Egypt and Sicily were two of the main sources for Roman food.The Romans obtained their food by either growing it or by importing it. Egypt and Sicily were two of the main sources for Roman food.The Romans obtained their food by either growing it or by importing it. Egypt and Sicily were two of the main sources for Roman food.
Mutation and sexual recombination.
Rice and noodles.
Tigris and Euphrates
solar and wind
You can get energy from Carbohydrates, Fat and to a lesser extent protein.
The two main sources of genetic variation are sexual reproduction, and mutation. Sexual reproduction is more common.