A response to changes in an ecosystem that results in entire populations moving from one ecosystem to another. I’m looking for the word for this definition ^

this is a tough one try to remember specific examples from you instructor but for reference when a forest catches fire almost all life moves or dies however producers and decomposes leave behind seeds and will take the new place of the forest since the decomposes can add nutrients to the soil from dead organisms.

the answer is d.) homologous; have mammary glands

thinking it would be physical characteristics