Which of the following characteristics of living things best explains why birds fly south for the winter
a
living things maintain internal balance
b
living things are based on universal genetic code
c
living things are made up of unites called cells
d
living things respond to their environment

Organisms are classified, or grouped into categories, based on similarities in their characteristics and/or evolutionary relationships. the study of how organisms are classified is known as

Body systems are not completely independent they integrate and work together describe one example of the integration between body systems

High blood pressure occurs when there is too much blood flowing through the blood vessels at one time. by changing the amount of water in the blood, blood pressure can change. the excretory system can to lower blood pressure. which would most likely occur in the kidney? a)more water would be transferred from the nephron. b)less water would be absorbed into the nephron. c)the amount of water in the bladder would decrease. d)the amount of water in the blood would increase.