1. standard metric unit of length
liter
2. a proposed explanation for a scientific problem
meter
3. standard unit of volume
mass
4. the curved top surface of a liquid column
meniscus
5. a quantity in an experiment that remains unchanged or constant
hypothesis
6. amount of matter in an object
control

emerging idea only occurs as a raw idea that could appear out of nowhere. meanwhile, to reach scientific consensus , that idea must be structured and tested over and over again through various experiments. the scientific consensus transforms the raw idea into idea that is more reliable through the process of scientific elimination.

the answer is d p: cell, q: organ, r: organ system, s: tissue