Multicellular animals have levels of organization. what characteristic of cells makes this possible?

Eristics do scientists use to distinguish between organisms in different kingdoms

There are specialized producers that live in warm water vents deep in the ocean. these producers do not per-form from photosynthesis, but instead perform a similar process with iron and other chemicals. why do you think these producers use this process instead of photosynthesis?

Which was most likely an effect on society that resulted from improvements in blood handling during world war i and world war ii?