Who used a compound microscope to see chambers within cork amd named them cells

Pentane with molecular formula c5h12, exists in three isomeric forms. one shows linear carbon chains, another has one -ch3 groups present on the third carbon atom, and the third has two -ch3 groups present on the second carbon atom. what types of isomers are these? a. geometric isomers b. structural isomers c. halotropic isomers

How does photosynthesis show the conservation of mass and energy?

Several billion years ago which gas was the least prevailant in the atmosphere