Evolution Test
The first life on Earth was only able to survive because
Oxygen built up in the atmosphere so photosynthesis and cellular respiration could occur.
No large predators were around to hunt small organisms.
The terrain and temperature less volatile and cooler, able to support life.
O All of the above

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.