The answer is D. We can't directly use the nitrogen from the air so we need the bacteria to change it into something that we can use.
The first two are correct, not sure on the third one but I assume no. The last one is also incorrect.
Robert Hooke observed the cells through a combination of lenses.
After Robert Hooke, the development of microscopy take place. After the development of the microscopy, scientist were able to observe the features of the cell. In order to formulate a cell theory observation of most of the cells was necessary. So, it was necessary to observe different types of cells from different organism. So, the advancement of the microscopy and observation process required for the formulation of the cell theory was the reason for the delayed development of the cell theory.
<em>Highlighted </em><em>muscles </em><em>are </em><em>the </em><em>muscles </em><em>of </em><em>the </em><em>neck. </em><em>It </em><em>is </em><em>a </em><em>group </em><em>of </em><em>four </em><em>muscles </em><em>which </em><em>helps </em><em>to </em><em>stabilize </em><em>the </em><em>shoulder </em><em>joint. </em>
<span>Estoy bastante seguro de que la respuesta a nuestra pregunta ya puede ver si el ángulo de noventa grados</span>