Ants from the genus pseudomyrmex live in bull's horn acacia trees, acacia cornigera. the ants will attack any predators of the tree. in return, the ants live protected in the thorns of the tree and eat the nectar and protein-rich secretions of the tree. this is an example of:

Consider the last statement in the prompt: "people take such environmental factors into account in their choices when deciding where to live." do all people have a choice as to where they live? what factor plays a key role in this decision and may therefore play a large role in determining quality of life?

What are two ways that harvesting algae from the ocean may benefit human society? how might the harvest of algae negatively impact the ocean communities where that algae grows? how could this be prevented?

During an experiment, readings for blood pressure in a persons body were found to be constant . however , when he measured by a different blood pressure cuff , the readings differed by 15 points for each reading. this difference indicates that the results are