Kirsten is trying to remember events from her life as an 18-month-old. however, as hard as she might try, she has no conscious memory for anything that occurred before her third birthday. this is likely due to the fact that the in her brain was not fully developed at that age.

This is likely due to the fact that the hippocampus in her brain was NOT fully developed at that age.

Explanation:

The hippocampus is the part of the brain where explicit memories are formed. The hippocampus is not full developed when birth occurs and takes about two years in happening. An effect of this is infantile amnesia, which means that most people do not have explicit memories from the first couple years of life.

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:

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.