Answer:
The correct answer is A) They are made of one or more cells.
Step-by-step explanation:
Organisms are all made of cells, which are the constitutive unit of living beings. Organisms can be made of one cell (unicellular organisms) or more than one cell (pluricellular organisms).
Option B is not correct because reproduction can be sexual and asexual.
Option C is not correct because organisms can be prokaryotic (such as bacteria) or eukaryotic (such as animal and plants).
Option D is not correct because the organisms which require carbon dioxide to produce food are plants.