Ahammer is being used to remove a nail from a piece of wood what kind of simple machine is

Plz ! for many generations farmers in north america have been choosing to cross corn plants with large ears of corn each year this results in the new generation of plants also growing large ears of corn. what is the technique called? a. selective breeding. b. natural selection. c. mitosis. d. asexual budding.

Explain why ecosystem diversity results in species diversity in a healthy biosphere

What is the problem in this article? what solution does the article propose?