Why must an in vitro observation be confirmed in vivo?
A. A living thing does not make its own enzymes.
B. A test tube is exactly like a living cell.
O
c. Some enzymes behave unnaturally in a test tube.
O
D. Observations in a test tube are easy to make.

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.