Answer:
By far, the most abundant gas in the Earth's atmosphere is nitrogen, which accounts for about 78% of the mass of dry air.
Explanation:
B. A decrease in crop diversity is an environmental concern. Weed killers will wipe out other strains of crop leaving only the engineered resistant type.
They both can be traced back millions of years ago
#1 the relationship between universes and galaxies is that galaxies are made up of universe. and the relationship between stars and solar systems is every solar system contains at least one star.
#2. galaxies form after several planets form rather close to each other.
#3. the last one I don't know
Answer: i dont know the question
Explanation: