I have solved part of it 2. is constantly 6.compass and part of number 3.is sun
D. the number of mates on the island
their appearance changes cause different birds breeding together can make an impact of how the bird looks
Protons(Atomic Number) - 20
Electrons(Normally the same as protons) - 20
Neutrons(Mass number-proton number) - 20
Answer:
sophisticated irrigation, chemical fertilizers, chemical pesticides
Explanation:
The use of irrigation to provide needed water and the use of natural fertilizers to promote crop growth are farming methods that have been practiced for centuries. More sophisticated irrigation techniques, various chemical pesticides, and modern chemical fertilizers have been developed in the twentieth century.
