Answer:
Bacteria
Explanation:
All bacteria are microscopic (approx. 1 µm - 5 µms in size) and not visible with the n.aked eye. A microscope is needed to view them.
Answer:
Osteichthyes (type of bony fish)
Explanation:
hope it helps
Pernicious anemia can be defined as a medical condition in which the body of the affected individual is unable to make enough of the healthy red blood cells. The lack of the vitamin B-12 in the body of the affected person results in this condition. It is treated by giving Vitamin B-12 pills to the patient.
Hence, the answer is 'Vitamin B-12'.