Here are 3 principles! Hope this helps!!
1 all living organisms are compound by one or more cells
2 the cell is the structure and functional basic unit of life.
3 all cells originated from other cells
Some other secondary consumers are carnivores and others are omnivores because they also eat both plants and meat. For example Human, human are secondary consumers, and human eat both plants and meat. There are also other animals that are considered as omnivores.
Answer:
Rods
Explanation:
Rods are specialized photoreceptors that function best in low-light conditions. They are a major part of our vision in dimly lit environments, as well as our perception of movement in our peripheral vision.