Are chemicals internal or external?

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area

Human genes only differ by less than percent. a. 1 b. 6 c. 11 d. 16

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