We know seeds are very important for us. Some plants have more 1.____ than other plants. Little seeds will grow up to be new 2.____.

Seeds have no feet and no wings. But some seeds are good travelers. Do you know, how do seeds travel? 

Yes. Seeds travel in 3.____ ways. Some seeds travel with wind，we know 4.____ travel with wind. Some seeds travel with water. For example,5. ____ travel with water. And we also know 6._____ travel with animals. But, how do 7._____travel? They travel by themselves.