Help Science Easy Many experts believe that if we continue to use fossil fuels at the rate we are now, we will run out of this natural resource by the middle to end of the twenty-first century. Fossils fuels, the remains of once living plants and animals, primarily recycle the element and when burned, these fuels add the element back into our atmosphere.
A) carbon

B) oxygen

C) hydrogen

D) carbon dioxide

Compare and contrast physical changes with chemical changes.

Which are examples of how technology has advanced scientific understanding.1using hot water to sterilize medical equipment.2transplanting a human organ into another individual.3inserting genes from one sheep into another cell to make a cloneunderstanding the different structures that make up a cell.4examining microorganisms from the deepest parts of the ocean

Need asap question 1 minerals are organic compounds. true false question 2 what vitamin can be found in foods like oranges, grapefruits, and broccoli? a. vitamin a b. vitamin k c.vitamin c d. vitamin d question 3 what are minerals? a. chemical elements that are needed for body processes. b. organic compounds that the body needs in small amounts to function properly. c. small molecules used to build proteins. d. an organic compound that is insoluble in water and includes fats. question 4 how many types of vitamins does the human body need? a. 15 b. 11 c. 13 d. 17 question 5 vitamins are a good source of energy. true false