Dark reactions does'nt need light. Instead, dark reactions use ATP (Adenosine Triphosphate) and NADPH ( Nicotinamide Adenine Dinucleotide Phosphate) to produce energy molecules.
Light reactions need light to produce organic energy molecules ATP and NADPH.
Fossils are used to determine the ages of rock layers. ... Index fossils are of organisms that lived over a wide area. They lived for a fairly short period of time. An index fossil allows a scientist to determine the age of the rock it is in.
So it can be easily accesed. and also because if they didnt, it would be outdated with todays technology. hope this helps.
Cactus would be ideal for desert living.
