Answer:
The fish did not yet exist when the old layers of rocks were deposited. In fact, animals with hard parts did not evolve until about 600 million years ago, which is only about 13% of the 4.5 billion year age of the Earth. Multicellular animals without hard parts left tracks in older sediments, but had no fossilize-able body parts.
Explanation:
Answer: Option C
Explanation:
The lymphatic system can be defined as a system of network of tissues and organs that helps the body to clean toxins and other materials of the body that is not required.
The main function of the lymph is to transport lymph, which is a fluid that helps in fighting with infection.
The pathway that is followed by the lymphatic system inside the body is lymph nodes→ lymph vessels→lymph capillaries→ subclavein veins.
Remember the cell theory by Virchow that states that all cells come from pre existing cells, if a single cell dies, it can be replaced unless it's a brain cell.
