Which statement about scientific notation is true? O A. It provides a way of measurement without units.
B. It allows scientists to make calculations more easily.
C. It allows scientists to invent new units of measurement.
D. It is a system of mathematical symbols used to describe energy
and matter.

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.

Which characteristics are typical of a human population in the postindustrial stage?

Amarine ecologist has constructed the conceptual model shown in the diagram. what predictions can be made from using this model? where the tertiary consumers get their energy how often primary producers are able to reproduce when bacteria and fungi initiate the process of decomposition whether other secondary consumers are present