1					2											3
											4			5
				6																		7
																8				9
				10
															11
													12
								13
			14					15
															16					17
			18
	19
															20
										21
					22
	23												24
25

Across 1. a large number of monomers linked together 5. information from the organisms environment 6. substances that either take up hydrogen ions or release hydroxide ions 10. to maintain a stable internal balance 11. have a backbone of four fused carbon rings 13. organisms that cannot produce their own food 14. to make another organism like one self 16. atoms of the same element that differ in the number of neutrons 18. results when 2 atoms share electrons in such a way that each atom has 8 electrons on outer shell (2 Words) 21. atoms that are joined together form this 22. smallest part of an element that displays the properties of the element 23. ionic compounds being held together by positively and negatively charged ions (2 Words) 24. a group of similar, interbreeding organisms 25. organic molecules that have the same molecular formula, but different shapes

Down 2. a substance that cannot be broken down into simpler substances by ordinary chemical means 3. organisms that produce their own food 4. composed of tissues functioning together for a specific task 7. a group of cells with a common structure and function 8. all chemical reactions that occur in a cell 9. substances that release hydrogen ions when they dissociate in water 10. results when 2 atoms share electrons in such a way that the outer shell contains 2 electrons (2 Words) 12. a process that transforms solar energy into the chemical energy of organic nutrient molecules 15. to change through life 17. located in the nucleus of an atom, does not move, has an electric charge of +1 19. polymers composed of amino acid monomers 20. substance that keeps pH within normal limits