MS-E551-4 5. Synthesize Infornation Why do you think scientists use mass extinctions to separate one era from another?

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

1)

i))the process of preparing food by green plants in the presence of sunlight is called photosynthesis.

ii) leaf is the site for photosynthesis.

iii) it takes place as,

6h2o+6co2=c6h12o6+602