How did the first cell appear?
How did the first cell appear?

How did the first cell appear?
When did the first cells appear?
Where did the first cells appear?
What is a living organism?
Explain the structure of human sperm with a neat labelled diagram.
Describe a transmissible disease as a disease in which the pathogen can be passed from one host to another
Describe that a double circulation provides a low pressure circulation to the lungs and a high pressure circulation to the body tissues
Describe the functions of the types of human teeth in physical digestion of food
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