Final answer:
To determine if national lawn care companies have a greater number of combined customers than ever before, factual data on industry trends or customer statistics is required. Without this data, the truth of the statement cannot be verified.
Step-by-step explanation:
The question National lawn care companies have more combined customers than ever before. is seeking a true or false answer. This information could potentially be found in industry analysis reports, customer trend data, or financial statements of major lawn care businesses. Unfortunately, without specific data, we cannot confirm the veracity of the statement, and it is not possible to provide a fact-based answer. However, if recent trends or substantial market growth in the lawn care industry were documented, one might infer that the number of customers would have likely increased as a result.