This is because elements are pure substances with only one atom. When two or more elements are combined, you get compound elements; which allows for more substances to be created.
I agree with the other person you answered the answer is B duckweed growth
In a survey, it says that human's DNA are 99% the same.
Hope this helps! :)
Answer:
To find the volume of a rectangular object, measure the length, width and height. Multiply the length times the width and multiply the result by the height. The result is the volume. Give the result in cubic units, such as cubic centimeters.