If a scientist is observing biotic and abiotic factors, which of the following level of organism must she be studying?

You would want this observation to be in an area with a lot of biotic and abiotic factors, so the best place for it is an ecosystem. 

Centimeters would be the most accurate tool to measure with

1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.