Plant species differ in that renewed growth in spring can be triggered by day length or by temperature or else by a combination of both. Day length is the same, year after year, for any given date. Ttherefore, any plant species that starts to grow again on widely different dates in different years resumes growth at least in part in response to temperature.
The argument that some landfills charge garbage companies by volume only, some charge by weight only, and all others use a formula sensitive to both volume and weight, and that if at a particular landfill the charges for two particular loads of equal volume dumped on the same day are different, weight must determine, or help determine, charges at that landfill is most similar in its pattern of reasoning to the argument above.