Which of the following is an inference? a.
The flower is pink.
b.
Vinegar has a pungent aroma.
c.
A dog barks.
d.
A cup with steam coming from it will be hot to the touch.

An observation is .

the transfer of energy between two molecules spaced just nanometers apart plays a key role in many technologies, including photovoltaics, quantum information systems, lighting, and sensors, as well as in biophysics to measure nanometer distances and in photosynthesis. but an open question in this area is what effect, if any, the surrounding photonic environment has on this nanoscale energy transfer. by designing and performing a carefully controlled experiment to answer this question, scientists have settled the debate and found clues to improving the efficiency of many of the technologies that rely on this process.

explanation:

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.