batay sa editoryal isa-isahin ang mga panghihikayat na sinabi niya sa mga tao para masolusyunan ang problema

Hemoglobin is a proton that carries oxygen around the body what is hemoglobin made from

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled

Which nutrients contain nitrogen in addition to carbon hydrogen, and oxygen? a) vitamins. b) proteins. c) carbohydrates. d) fat