Scientific knowledge may change when it is reexamined. For example, scientists in the 1930s proposed changing the way in which organisms were classified. They expanded the number of kingdoms from three to four. The scientists placed the bacteria, which had previously been classified with other single-celled organisms, into this fourth kingdom. What was the main reason for this change in the classification system?

When water freezes, it . contracts expands

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.

What best describes lactic acid fermentation?