What system is composed of many glands, such as the pituitary gland or the thyroid gland

How did the research presented in the article affect scientists' understanding of the evolution of eukaryotes

How did the discovery of the rhesus factor affect society? o more patients died from having a transfusion with the wrong rhesus factor 0 new treatments during pregnancy could prevent harm to the developing child. o less donated blood could be used in the treatment of patients. the number of blood types was reduced by half

Explain how scientists use geologic time to determine the age of landforms.