Answer: The correct option is d. the improvement of the microscope and microscopic techniques.
In the 1600s the development of cell theory was led by advances in microscopy. The cell theory is historic in terms of scientific theory. According to the theory it was proposed that all living organisms are made up from cells, cell is the basic structural unit in all the organisms and new cells arise from pre-existing cells. The continuous improvement of microscopy with time and advancements in magnification technology were enough for discovering the cells and contributed the most towards the cell theory.
The organ that directly interacts with blood to remove carbon dioxide and provide oxygen is the lungs
A warm spell during the Ice Age gave early humans a route out of Africa 20,000 years earlier than thought, say scientists who've uncovered a prehistoric tool kit in Arabia. ... Seas in the region would still have been at relatively low, Ice Age levels, making for shorter crossings.
Answer:
A
Explanation:
Eukaryotic plasma membrane proteins are synthesized on free ribosomes and inserted after translation into the plasma membrane.
