Question

1. State two limitations of using fossil records in retracing evolutionary history of living organisms.
2. Describe cell biology as an evidence of organic evolution.

Answer 1

1.  
   1. Missing links due to complete decomposition of some organisms. Acc. some parts  decomposing
   2. Distortion of parts during sedimentation.
   3. Destruction of fossils by geological activities (earthquakes/faulting/mass movement of earth surfaces/ volcanicity)
2.  
   1. Presence of similar cell organelles ( mitochondria, ribosomes,lysosomes);
   2. Similar biological chemicals(ATP/proteins/DNA); 
   3. Similar blood pigmentation in tissues of some groups of animals show they have a common phytogenetic origin.