You forget to close the lid on the milk, that causes it to spoil.
I hope this helps!
B. Macromolecules is the answer.
Answer:
As they produce food by the process of photosynthesis which cannot be done by anyone else. Plants use chlorophyll, CO2 and H2O in photosynthesis( which is a biochemical process). Plants became a cause of life on earth. Hence plants are the ultimate source of food on earth.
The answer is: "sexual dimorphism" .
_____________________________________________________
