Alexander Fleming discovered the penicillin in 1928. He noticed that some bacteria he had left in a petri dish had been killed by naturally occurring penicillium mould.The penicillin began the era of antibiotics, has been recognized as one of the greatest advances in therapeutic medicine. The research required to determine if the penicillium extract was safe and killed bacteria was done at Oxford University.P<span>rogram of animal experiments and clinical trials was carried.</span>
A chloroplast are used for the process of photosynthesis which makes food
Answer:
.......is called chemical compound
When earth worms bring fine rocks to particles they do it in mechanical weathering
The sodium and potassium ions are transported using a sodium potassium pump the process of moving sodium and potassium ions across the cell membrane.
