Respuesta :
Answer:
Scientists developed a theory called _Cell_ _Theory_ after observing organisms for a long time. Because most cells are too small to see, cell theory only started to form after the invention of the _microscope_ in 1590. Today, cell theory is well supported by decades of research.
Well 2nd sentence reveals the theory is called the cell theory which is 2 words and perfectly fits into the blank on the top. Then after some research I stumbled across an article and after reading through it revealed that the theory was based of the discovery of the cell after the invention of the microscope in the 16th century. Nevertheless, here is all you need to know:
(Website link: https://www.britannica.com/science/cell-theory)
- This helped advance the field of biology.
- The cell theory was developed by German scientists named Theodor Schwann and Matthias Jakob Schleiden in the year of 1838.
- The theory was about how all animals and plants are made out of cells.
- Schwann and Schleiden later extended this theory and made new discoveries revolving cells
- In 1838, botanist Matthias Jakob Schleiden who was interested in plant anatomy states that lower plants have one cell and higher plants are composes of many individual cells. Later physiologist Theodor Schwann, Schleiden’s friend, extended this theory to include animals.
- The two scientists together made further discoveries and in the 1839 stated that "cells are the “elementary particles of organisms” in both plants and animals and recognized that some organisms are unicellular and others multicellular."
