Which of the following is not a characteristic of animals?
(1) all animals have a definite shape.
(2) all animals are many-celled.
(3) all animals use energy.
(4) the cells of all animals have nuclei and organelles.

Which system revise and send electrical signals throughout the body

Plz fast biotechnology is a growing field of applied biology. many crops such as corn have been engineered to be resistant to herbicides. therefore farmers can spray these chemicals to kill weeds growing near the crop without worries of killing the crop itself how does this type of biotechnology work? a. by changing the genetic make up of the crops. b. by causing the crops to kill the weeds. c. by changing the type of crops used. d. by changing the location of the crops.

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots