Over the past few thousand years, humans have
to bring about changes in many plant and
animal species in order to make them more
useful. examples include strong workhorses,
hunting dogs, large-eared corn, and beautiful
flower varieties. these changes were primarily
brought about by humans, using the process of
(1) mitosis (3) cloning
(2) selective breeding (4) natural selection

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

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.

If there is another new infectious disease somewhere in the world, what do you think canadian officials should do