Question

write one common feature of amoeba and white blood cells of humans

Answer 1

Amoeba is a unicellular cell

white blood cells fight to bacteria to protect us from diseases

Answer 2

The only common feature between amoeba and the white blood cells in humans is that both are unicellular.  

Explanation:

This implies that both consist of only one cell. Other than that amoeba is a whole organism in itself while white blood cells are part of the human body. They in themselves cannot take up any identity. Their original purpose is to fight diseases in the human body and maintain the proper blood quality.

As far as amoeba is concerned it is a single celled organism that has its own identity and procreate to develop offspring using asexual methods.