Which of the following would be the best way for a farmer to sustain the nutrients in the soil of her farm? A. Add human-developed pesticides to the topsoil. B. Change the types of crops that are planted after each harvest. C. Allow rainwater to erode most of the topsoil. D. Plant the same types of crops each year.

What evidence supports the law of conservation of energy? a) mechanical energy is converted to chemical energy during photosynthesis. b) oxygen is made from the breakdown of carbon dioxide during photosynthesis. c)energy is absorbed by chlorophyll and becomes chemical energy during photosynthesis. d)the sun gives off light energy that is absorbed by plants.

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

Which statement correctly describes other ways in which nebulae and stars are different? a. a star always has a higher density than a nebula. b. stars can form inside a nebula but a nebula can never be produced by any star. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star. reset submit