Chemistry
What is the most gas in the air
N2
When will the reform and opening up take place
1978.12
What is the difference between the plants and animals
Plants cells have cell walls，while animal have no cell walls
What is the formula of Pythagorean theorem
a2+b2=c2
What is the GDP mean
the total output produced in a country
What are the renewable resources
wind energy，solar energy and so on
How many years old is china
5000
Biodiversity is divided into several categories
3
Solve 9<3n+6≤21 for integer values of n
2.3.4.5
What did the first chapter of the economy say?
Unlimited desires and limited resources
What is potassium flame reaction
purple
What kind of race are the native Americans
Indians
How do plants reproduce
Seed reproduction, spore reproduction
When did world war I take place
1900
Which race is strongest in the world
person in hiding
How many camps did the first world war fall into?
2
What are the determinants of biological variation
Genetic material