Photosynthesis plays an important role in maintaining life in most ecosystems on Earth because it has an impact on how organisms obtain their energy. Write a claim that supports
the idea that photosynthesis helps sustain life on Earth, and support that claim with at least
one piece of evidence.
CLAIM
EVIDENCE DATA
REASONS HOM/WAY

thats how its supposed to be

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.