Final answer:
An invasive tumor is a cancer that spreads to surrounding tissues, while a pre-malignancy or non-invasive tumor is a neoplasm that has not invaded but could become cancerous. It is crucial to combine different scientific methods to understand and manage these medical and ecological situations.
Step-by-step explanation:
An invasive tumor is a type of cancer that has the potential to invade and spread to surrounding tissues. In contrast, a pre-malignancy, pre-cancer, or non-invasive tumor represents a condition where a neoplasm has not yet invaded but may progress to cancer if not treated. Conditions such as atypia, dysplasia, and carcinoma in situ are examples of non-invasive stages that could potentially become invasive over time. The dynamic nature of these conditions underscores the importance of combining various scientific approaches, including modeling, field observations, and demographic studies with genetic data, to better understand and manage these medical and ecological challenges.