The primary producers of the food web are plants. Algae, ferns, etc... All require energy from the sun. Now up the next level is plant eaters and omnivores. Next up the ladder are the carnivores and omnivores. The energy transfer. Works from the sun, to the plants, to the animals to the other animals, to finally decomposes.
The answer to this would be D: physical components of the environment, such as rocks and sand. The word "biotic" mean all the living organisms within an ecosystem such as plants and animals.
I think the correct answer from the choices listed above is option A. The difference between a normal cell and a cancer cell is that a normal cells undergo while cancer cells don't Also, normal cells respond to signals while cancer cells don't.
