Answer:
Characteristics used to classify stars include color, temperature, size, composition, and brightness.
Explanation:
Answer:
Chemicals used to increase crop growth: fertilizers
Chemicals used to prevent insect infestation of crops: pesticides
Choosing the single most efficient crop variety for the exisiting conditions: monoculture
Planting different crops each year for healthier fields: crop rotation
Explanation:
The answer is ethere B or D
False, sources of salt water are ocean, sea water, <span>Some of the ocean's salts have been dissolved from rocks and sediments below the sea floor</span>Others have escaped from the Earth's crust through volcanic vents as solid and gaseous materials.