How is the carbon dioxide produced by humans during respiration?

Which are forms of nitrogen that are usable by humans

Which of the following is a common danger of commercial fishing?

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.