Please define menstruation

Which is the best way to define a common in environmental science a. a worthless resource b. shared resource c. a rare resource d. a typical resource

How are gene and protein sequences used to classify organisms?

Which best compares habitat and niche? o niche is a place in which organisms live, and habitat is the way in which an organism fits into its habitat. o habitat is a place in which organisms live, and niche is the way in which an organism fits into its habitat. habitat is a group of organisms that live in an area, and niche is a specific species that lives in that areao niche is a group of organisms that live in an area, and habitat is a specific species that lives in that area.